Abstract

Provided is a power supply system for arc furnace and a method for controlling the same, and an arc furnace facility having a power supply system, the power supply system includes a power converter, and a polyphase transformer, a first disconnecting means connecting an input of the power converter to a primary circuit of the transformer, and a second disconnecting means connecting an output of the power converter to the primary circuit of the transformer, the power supply system also includes a first isolation switch and a second isolation switch, and a control circuit.

IPC Classes  ?

• H05B 7/148 - Automatic control of power
• F27D 11/08 - Heating by electric discharge, e.g. arc discharge
• F27D 19/00 - Arrangement of controlling devices
• F27D 99/00 - Subject matter not provided for in other groups of this subclass
• H05B 7/18 - Heating by arc discharge

Abstract

Provided is a multilevel inverter for converting a DC voltage into an AC voltage or an AC voltage into a DC voltage, including at least one phase (P) and a method for controlling the same, the multilevel inverter includes a set of capacitors including N capacitors, N being an integer greater than or equal to three, the multilevel inverter having N+1 levels, a balancing device to balance the voltage on the terminals of each of the capacitors of the set of capacitors, and a switching module for switching the input DC voltage and being able to convert the input DC voltage into the respective phase of the output AC voltage.

IPC Classes  ?

• H02M 7/483 - Converters with outputs that each can have more than two voltage levels

Abstract

Provided is an anti-vibration mount for machine that includes a first support part, a second support part separated from the first support part by a predetermined gap, and at least a first damping module that includes a first enveloping surface of the first support part, a first enveloping surface of the second support part, and a first vibration damping element connecting the first enveloping surface of the first support part and the first enveloping surface of the second support part, the first enveloping surface of the first support part encompassing partially the first vibration damping element and the first enveloping surface of the second support part encompassing partially the first vibration damping element.

IPC Classes  ?

• F16F 3/087 - Units comprising several springs made of plastics or the like material
• F16F 3/12 - Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber combined with springs made of steel or other material having low internal friction the steel spring being in contact with the rubber spring, e.g. being embedded in it
• F16M 5/00 - Engine beds, i.e. means for supporting engines or machines on foundations

Abstract

A cooling system for cooling an item of industrial equipment is described. The cooling system includes a primary circuit around which a cooling fluid is circulated, and which includes a two-phase heat exchanger. A secondary circuit is fluidly connected to the primary circuit in parallel with the heat exchanger. The secondary circuit includes a condenser, a pump, a separator and reservoir tank and a restrictor. The boiling point of the cooling fluid at the inlet of the heat exchanger is reduced by the action of the secondary circuit, thereby improving the cooling performance of the cooling system.

IPC Classes  ?

• F25B 25/00 - Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups
• F25B 23/00 - Machines, plants or systems, with a single mode of operation not covered by groups , e.g. using selective radiation effect
• F25B 41/20 - Disposition of valves, e.g. of on-off valves or flow control valves

Abstract

Provided is an electrical machine that includes first machine terminals electrically connectable to first loads and second machine terminals electrically connectable second loads. A stator of the electrical machine includes first stator coil groups, each first stator coil group defining a stator phase and having interconnected first stator coils, and second stator coil groups, each second stator coil group defining a stator phase and having interconnected second stator coils. A power electronic switching assembly that includes first switching module assemblies electrically connected to or between the first machine terminals and second switching module assemblies electrically connected to or between the second machine terminals. Each first switching module assembly includes interconnected first switching modules. Each first switching module is electrically connected to a first stator coil group. Each second switching module assembly includes interconnected second switching modules. Each second switching module is electrically connected to a second stator coil group.

IPC Classes  ?

• H02K 11/33 - Drive circuits, e.g. power electronics
• H02K 3/04 - Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
• H02K 5/22 - Auxiliary parts of casings not covered by groups , e.g. shaped to form connection boxes or terminal boxes

Abstract

Provided are a method for and a power supply system for a plurality of electrolyzers that includes main input terminals to be connected to a grid, an AC/AC power converter, a control circuit, a plurality of supply branches, each having a branch transformer that includes a primary circuit connected to input terminals of each supply branch and at least one secondary circuit, and at least one rectifier connected to the secondary circuit of the branch transformer, the rectifier having output terminals connected to a set of output terminals of each supply branch to supply the output terminals of each supply branch with a DC current.

IPC Classes  ?

• H02M 5/42 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters

Abstract

A power transmission system comprising: - a power substation (13), - a plurality of power subsystems (9, 10), and - a direct current cable (12) is proposed. The power substation comprises a primary modular multilevel converter (15). Each power subsystem (9, 10) comprises a secondary transformer (19, 20) and a secondary modular multilevel converter (21, 22), the direct current cable (12) connecting the primary modular multilevel converter of the power substation and the secondary modular multilevel converters of the plurality of power subsystems in series.

IPC Classes  ?

• H02J 3/36 - Arrangements for transfer of electric power between ac networks via a high-tension dc link
• H02M 7/483 - Converters with outputs that each can have more than two voltage levels

Abstract

Provided is a shaft-less rotating electrical machine that includes a stator supported by a stator frame and a rotor that is mechanically connectable to a shaftline and is positioned radially inside the stator. The electrical machine is prepared for transport and includes a support structure for stably supporting the rotor inside the stator frame and the support structure includes one or more supports that are positioned in the air gap between the stator and the rotor, and one or more transport brackets. The transport brackets are fixedly connected between the stator frame and the rotor.

IPC Classes  ?

• H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• H02K 1/28 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Abstract

A power converter system is provided and includes a power converter having a first converter that includes at least a controllable semiconductor switch having a threshold voltage and a gate voltage for normal on-state conduction, DC terminals connected to a DC link, and AC terminals, a controller of the system supplies current to the first converter for short circuiting by controlling the switches to create a short circuit path through the converter that carries the current. At least one switch in a short circuit path is operated with modified on-state conduction to increase conduction losses by applying a modified gate voltage less than the gate voltage for normal on-state conduction, the modified gate voltage equals the threshold voltage plus x volts, where x ranges from 100 mV to 4 V, and when the converter is short-circuited, the DC link voltage is less than that during a normal switching operation.

IPC Classes  ?

• H02M 1/36 - Means for starting or stopping converters
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A propulsor for a marine vessel is described. The propulsor includes a plurality of blades extending from a rotary housing. The blades are distributed around a blade pitch circle diameter of the rotary housing. A mounting plate rotatably mounts the rotary housing to a hull of the marine vessel. A slewing bearing includes a driven ring with a driven gear that is fixed to the rotary housing and a stationary ring fixed to the mounting plate. A diameter of the slewing bearing is at least 0.4 times the blade pitch circle diameter. The propulsor includes a main electric motor with a drive shaft mechanically connected to a driving gear. The driven gear of the slewing bearing and the driving gear define a single-stage transmission gear with a transmission ratio between 5:1 and 15:1.

IPC Classes  ?

• B63H 1/10 - Propulsive elements directly acting on water of rotary type with rotation axis substantially at right angles to propulsive direction, e.g. paddle wheels with adjustable vanes or blades with cyclic adjustment with blades extending axially from a disc-shaped rotary body
• B63H 23/10 - Transmitting power from propulsion power plant to propulsive elements with mechanical gearing for transmitting drive from more than one propulsion power unit

Abstract

An arrangement is described includes a pressurised gas system and a cyclorotor located within an annular structure. The cyclorotor can be a propulsor for a marine vessel and includes a rotary housing spaced apart from the structure by an annular volume, and a plurality of blades extending from a surface of the rotary housing, each blade having a respective blade axis about which it can be pivoted relative to the rotary housing. The pressurised gas system includes a pressurised gas supply, one or more gas outlets in fluid communication with the annular volume, and a gas supply unit with a controller adapted to control the delivery of pressurised gas from the pressurised gas supply into the annular volume through the one or more gas outlets.

IPC Classes  ?

• B63H 1/10 - Propulsive elements directly acting on water of rotary type with rotation axis substantially at right angles to propulsive direction, e.g. paddle wheels with adjustable vanes or blades with cyclic adjustment with blades extending axially from a disc-shaped rotary body
• G01M 3/26 - Investigating fluid tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors

Abstract

A cyclorotor is described that can be used as a propulsor for a marine vessel. The cyclorotor includes a rotary housing comprising a main body and a plurality of blade modules arranged circumferentially around the main body. The cyclorotor also includes a plurality of blade assemblies, each blade assembly being located in a respective blade module and having a blade extending from the rotary housing with a blade axis about which it can be pivoted relative to the rotary housing. Each blade assembly is associated with a blade actuator comprising an electric motor and having a drive shaft, a driving gear mechanically connected to the drive shaft and a driven gear mechanically connected to the respective blade assembly for pivoting the respective blade about its blade axis. Each blade module is preferably adapted to be detached and removed from the main body.

IPC Classes  ?

• B63H 1/04 - Propulsive elements directly acting on water of rotary type with rotation axis substantially at right angles to propulsive direction, e.g. paddle wheels
• B63H 21/17 - Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor

Abstract

Provided is a mounting arrangement for mounting a stator frame of a rotating electrical machine on a stationary foundation. The stator frame includes a stator foot adapted to support the stator frame on the foundation. The stator foot has a lower surface that faces an upper surface of the foundation, and an upper surface. The mounting arrangement includes a lubricant positioned between the lower surface of the stator foot and the upper surface of the foundation. The mounting arrangement is adapted to allow the stator foot to move in a lateral and/or axial direction relative to the foundation to accommodate thermal expansion of the stator frame in use.

IPC Classes  ?

• H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• F16M 5/00 - Engine beds, i.e. means for supporting engines or machines on foundations
• H02K 7/18 - Structural association of electric generators with mechanical driving motors, e.g.with turbines

Abstract

A power storage device is described. The power storage device has a dihydrogen production unit connected and configured to produce dihydrogen from electric power supplied by a grid and to store the produced dihydrogen, and an electric power production unit configured to supply the grid with electric power from dihydrogen produced by the dihydrogen production unit.

IPC Classes  ?

• H02J 3/28 - Arrangements for balancing the load in a network by storage of energy
• C25B 1/02 - Hydrogen or oxygen
• C25B 9/65 - Means for supplying currentElectrode connectionsElectric inter-cell connections
• H01M 8/0656 - Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by electrochemical means
• H02J 3/01 - Arrangements for reducing harmonics or ripples
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers

Abstract

AC-DC-AC converter for delivering power to an electric motor from a power source is presented. The AC-DC-AC converter comprises a front-end converter and a motor-end converter connected through a DC link, the DC link voltage being generated and controlled by the front-end converter.

IPC Classes  ?

• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02P 27/04 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage

Abstract

AC-DC-AC converter for delivering power to an electric motor from a power source is presented. The AC-DC-AC converter comprises a front-end converter and a motor-end converter connected through a DC link, the DC link voltage being generated and controlled by the front-end converter.

IPC Classes  ?

• H02M 7/483 - Converters with outputs that each can have more than two voltage levels
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/36 - Means for starting or stopping converters

Abstract

Provided is a switching module and a process of commutating the switching module. The switching module includes an H-bridge circuit with bidirectional switches and an active clamp with switches that are also arranged as an H-bridge. The process of commutating the switching module includes a sequence of alternating first and second commutation events where timing signals used to control the switches during each commutation event are varied according to closed loop control of the voltage across the energy storage device of the active clamp.

IPC Classes  ?

• H02P 6/14 - Electronic commutators
• H02K 3/28 - Layout of windings or of connections between windings
• H02K 11/33 - Drive circuits, e.g. power electronics

Abstract

A power supply system for arc furnace is described. The power supply system includes a power converter and a polyphase transformer. The power supply system further includes first disconnecting means connecting the input of the power converter to the primary circuit, second disconnecting means connecting the output of the power converter to the primary circuit, and the power supply system further includes a control circuit configured to control the power converter to supply the electrode and to stabilize the courant and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are open and the second disconnecting means are closed, and to control the power converter to stabilize the courant and the voltage delivered by the grid to reduce reactions in the grid when the first disconnecting means are closed and the second disconnecting means are open.

IPC Classes  ?

• H02M 3/315 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices

Abstract

A submodule for a power converter is described. The submodule includes a first and a second power storage devices and a first stack of electronic device packages. The first stack includes a first, a second, a third, and a fourth electronic device package. A first power device and the first and second electronic device packages form a first half bridge converter, and a second power device and the third and fourth electronic device packages form a second half bridge converter.

IPC Classes  ?

• H02M 7/00 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

Abstract

A power supply system for arc furnace is described. The power supply system includes a power converter intended to be connected to a polyphase supply grid and a polyphase transformer comprising a primary circuit connected to the power converter and a secondary circuit intended to be connected to at least one electrode of the arc furnace. The power converter includes an input device, a link circuit that has a first bus and a second bus, and an output device. The power supply system further includes a command circuit configured to command the input device and the output device to supply the electrode and to stabilize the courant and the voltage delivered by the grid when the electrode of the arc furnace is supplied by the power supply system to reduce rejections in the grid.

IPC Classes  ?

• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H05B 3/62 - Heating elements specially adapted for furnaces

Abstract

Provided are modular multilevel converter and hybrid modular multilevel converters. Each of the modular multilevel converters and hybrid modular multilevel converters include submodules. Each submodule includes a first half bridge converter, a second half bridge converter, and a dual active bridge converter having a first connection, a second connection, a third connection and a fourth connection. The first half bridge converter is interconnected with the first and second connections via a first capacitor included in the first half bridge and the second half bridge converter is interconnected with the third and fourth connections via a second capacitor included in the second half bridge.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion

Abstract

Provided is a rotor for a rotating electrical machine that includes a rotor body having an axis of rotation and at least one pair of circumferentially-adjacent pole modules each having a main body and a permanent magnet. At least one of each pair of pole modules is rotatable relative to the rotor body between a first position for normal operation where the magnetic fields generated by the permanent magnets of each pair of pole modules extend outside the rotor body and a second position for fault operation where the magnetic fields generated by the permanent magnets of each pair of pole modules do not extend substantially outside the rotor body.

IPC Classes  ?

• H02K 1/276 - Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• H02K 15/03 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets

Abstract

Provided is an AC-DC-AC converter for delivering power to a load from a power source that includes a front-end converter, a load-end converter, and a DC link. The front-end converter being a hybrid modular multilevel rectifier, and the load-end converter being either a modular multilevel converter or a hybrid modular multilevel converter.

IPC Classes  ?

• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H05B 7/00 - Heating by electric discharge

Abstract

Provided is an AC-DC-AC converter for delivering power to a load from a power source that includes a front-end converter, a load-end converter, and a DC link. At least one of the front-end converter and the load-end converter is a hybrid modular multilevel converter. The load-end converter or the front-end converter employ controllable switches in order to either direct or regulate power. The controllable switches can be controlled in order to modify the real and reactive power used/consumed or re-generated by the load (e.g., the electric arc furnace). The load-end converter control and the front-end converter control are independent or decoupled.

IPC Classes  ?

• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• F27D 11/08 - Heating by electric discharge, e.g. arc discharge

Abstract

Provided is a method of mechanically disconnecting an electrical machine from a rotor shaft. The electrical machine includes a stator and a rotor that is mechanically connected to the rotor shaft by one or more mechanical fixings. With the rotor shaft stopped, either one or more supports are inserted into the air gap between the stator and the rotor or the stator is raised relative to the rotor so that the stator contacts the underside of the rotor. The rotor is therefore supported by the one or more supports or by the stator. The one or more mechanical fixings are removed to mechanically disconnect the rotor from the rotor shaft. The electrical machine is moved axially away from a part of the rotor shaft such as a shaft flange.

IPC Classes  ?

• H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines

Abstract

A control system of a polyphase power converter has a regulation device configured to generate a control parameter that includes a drive setpoint value or a pulse duration associated with the drive setpoint value of at least one phase situated in a non-linearity zone of a chart and a control optimization system configured to receive the control parameter generated by the regulation device to control the polyphase power converter to deliver a balanced voltage system. The control optimization system modifies each phase of the control parameter so that it is in a linearity zone of the chart. The control parameter of each of the phases is modified in the same manner.

IPC Classes  ?

• H02M 5/293 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H02M 7/5395 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation

Abstract

Described herein is a rotating electrical machine, set of such machines, and associated boat and rolling mill. The rotating electrical machine includes a stator, a shaft centered in the stator, a first cylindrical magnetic mass and a second cylindrical magnetic mass, the first cylindrical magnetic mass and the second cylindrical magnetic mass enclosing the shaft and arranged in series on the shaft, the first cylindrical magnetic mass and the second cylindrical magnetic mass being separated by an air gap, the stator including coils, each coil being opposite to the two cylindrical magnetic masses. Each cylindrical magnetic mass includes a stack of compacted laminated magnetic sheets, first fastening means configured to fix the first cylindrical magnetic mass and the shaft, and second fastening means configured to fix the second cylindrical magnetic mass and the shaft.

IPC Classes  ?

• H02K 17/18 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having double-cage or multiple-cage rotors
• B21B 35/00 - Drives for metal-rolling mills
• B63H 21/17 - Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor

Abstract

The rotor for rotary electric machine has a magnetic mass clamped between two compaction elements, and tie rods passing through the magnetic mass and connecting the two compaction elements, at least a first compaction element has as many through holes as tie rods, each through hole of the first compaction element has a counterbore on one side opposite to the side in contact with the magnetic mass, each tie rod passing through a different through hole of the first compaction element and being fixed in the said through hole by a fixing element of the first compaction element logged in the counterbore, characterized in that each fixing element and the associated counterbore cooperate so that each fixing element is in contact with the counterbore in a radial direction of the rotor.

IPC Classes  ?

• H02K 1/28 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Abstract

Provided is a monitoring device for monitoring a control signal received by a power converter, the control signal controlling switches to supply an electrical load. The monitoring device includes a receiving circuit that receives the control signal comprising a merging of a first variable signal and a clock signal having a predetermined frequency greater than the first variable signal, a determining circuit that determines if a change of state of the control signal occurs during each period associated to the predetermined frequency, and a monitoring circuit that stops the transmission of the control signal to the power converter so that the power converter stops to supply the electrical load according to the instructions of the first variable signal if a change of state of the control signal does not occur during one period.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 1/36 - Means for starting or stopping converters
• H03K 17/0812 - Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
• H03K 19/21 - EXCLUSIVE-OR circuits, i.e. giving output if input signal exists at only one inputCOINCIDENCE circuits, i.e. giving output only if all input signals are identical

Abstract

An electrical component includes a magnetic core, an insulator, and a first winding. The insulator includes a first aperture disposed about a first portion of the core and a first insulator passage extending through the insulator, encircling the first aperture. The first winding extends through the first insulator passage and conducts an electrical current.

IPC Classes  ?

• H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
• H01F 27/29 - TerminalsTapping arrangements
• H01F 41/04 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets for manufacturing coils
• H01F 27/32 - Insulating of coils, windings, or parts thereof
• H01F 41/12 - Insulating of windings

Abstract

Provided is a synchronous electrical machine that includes a machine housing having a stator and a rotor lodged in the stator, the rotor being separated from the stator by an airgap, and the machine housing dissipating thermal losses generated by the stator. The stator having stacks of laminations and at least one channel extending along a longitudinal direction of the stator and formed in the laminations, two adjacent stacks of laminations being separated by pins or spacers to form an extraction duct connected to the channel, the machine housing further having an extraction opening so that a fluid injected in the air gap at the ends of the stator flows in the extraction duct and in the channel, and is extracted from the machine through the opening to cool the stator and the rotor.

IPC Classes  ?

• H02K 1/20 - Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
• B63H 21/17 - Use of propulsion power plant or units on vessels the vessels being motor-driven by electric motor
• B63H 21/38 - Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like

Abstract

Provided is an electric stabiliser for stabilising a floating structure that includes a track for guiding a mover as a moving stabiliser mass. A direct current (DC) linear motor includes a planar stator that extends along the track and the mover that is adapted to move forwards and backwards along the track as the stabiliser mass. The planar stator includes a polyphase stator winding with winding coils connected. The mover includes permanent motor magnets facing the polyphase stator winding that define mover poles of alternating polarity along the track direction. Two active magnetic bearings is positioned between the track and a main body of the mover for selectively levitating the mover. In use, the active magnetic bearings levitate the mover above the track and the DC linear motor is controlled to move the mover backwards and forwards along the track to dampen a rolling/pitching movement of the floating structure.

IPC Classes  ?

• H02K 41/02 - Linear motorsSectional motors
• B63B 39/00 - Equipment to decrease pitch, roll, or like unwanted vessel movementsApparatus for indicating vessel attitude
• H02K 7/09 - Structural association with bearings with magnetic bearings

Abstract

Provided is a synchronous electrical machine that includes a stator and a wounded rotor, the stator having a plurality of phases, each phase comprising coils connected together and magnetic stator poles cores fixed on a stator frame and evenly distributed along a stator diameter, each coil being wounded around a different magnetic stator pole core to form a magnetic stator pole, each phase comprising a same number of magnetic stator poles, the magnetic stator poles of each phase being disposed in the stator frame to form a concentric winding stator. The rotor includes a plurality of magnetic rotor pole cores evenly distributed around the rotor and rotor coils, each rotor coil being wounded around a different magnetic rotor pole core to form a magnetic rotor pole.

IPC Classes  ?

• H02K 19/10 - Synchronous motors for multi-phase current
• H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• H02K 13/00 - Structural associations of current collectors with motors or generators, e.g. brush mounting plates or connections to windingsDisposition of current collectors in motors or generatorsArrangements for improving commutation
• H02K 1/20 - Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium

Abstract

Provided is a modular multilevel converter and a method for synchronizing outputs of sub-modules of the converter. The modular multilevel converter includes sub-modules connected in parallel, and each sub-module generates an output. The modular multilevel converter also includes a controller that is communicatively coupled to the sub-modules. The controller controls a flow of one or more synchronizing signals between the plurality of sub-modules, such that each sub-module receives the synchronizing signals in opposite directions simultaneously, thereby controlling a synchronization of the outputs generated by the sub-modules.

IPC Classes  ?

• H02M 7/483 - Converters with outputs that each can have more than two voltage levels
• H02M 7/493 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel

Abstract

Provided is a hybrid modular multilevel converter (HMMC) based on a neutral point pilot (NPP) topology and having an ABC N-phase structure. The HMMC includes N pairs of identical upper and lower arms, each upper and lower arm being composed of X submodules and Y sets of switches. The switches within each set are cascaded and connected in series, each of the submodules is formed of full-bridge silicon (Si) insulated-gate bipolar transistor (IGBT) converters, and at least one of the set of switches is formed of IGBTs of opposite polarities.

IPC Classes  ?

• H02M 7/487 - Neutral point clamped inverters
• H02M 1/00 - Details of apparatus for conversion
• H02M 7/483 - Converters with outputs that each can have more than two voltage levels
• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

Abstract

Provided is a hybrid modular multilevel converter (HMMC) based on a neutral point clamped (NPC) topology and having an ABC N-phase structure. The HMMC includes N pairs of identical upper and lower arms, each upper and lower arm being composed of X submodules and Y sets of switches. The switches within each set are cascaded and connected in series, each of the submodules is formed of full-bridge silicon (Si) insulated-gate bipolar transistor (IGBT) converters, and at least one of the set of switches is formed of IGBTs of opposite polarities.

IPC Classes  ?

• H02M 7/487 - Neutral point clamped inverters
• H02M 1/00 - Details of apparatus for conversion
• H02M 7/483 - Converters with outputs that each can have more than two voltage levels
• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration

Abstract

An arrangement is described comprising a pressurised gas system (30) and a cyclorotor (1) located within an annular structure (20). The cyclorotor (1) can be a propulsor for a marine vessel and includes a rotary housing (2) spaced apart from the structure (20) by an annular volume (22), and a plurality of blades (4a, 4c) extending from a surface of the rotary housing (2), each blade having a respective blade axis (6) about which it can be pivoted relative to the rotary housing (2). The pressurised gas system (30) comprises a pressurised gas supply (32), one or more gas outlets (36) in fluid communication with the annular volume (22), and a gas supply unit (34) with a controller (34b) adapted to control the delivery of pressurised gas from the pressurised gas supply (32) into the annular volume (22) through the one or more gas outlets (36).

IPC Classes  ?

• B63H 1/10 - Propulsive elements directly acting on water of rotary type with rotation axis substantially at right angles to propulsive direction, e.g. paddle wheels with adjustable vanes or blades with cyclic adjustment with blades extending axially from a disc-shaped rotary body

Abstract

A high power-density power converter (500) employs a liquid cooling system (200) to cool its transformers (120). In an embodiment, the coils (135) of a transformer (100) are embedded in a heat-conducting solid (epoxy or resin). The resin-embedded coils (135) are in physical/thermal contact with cold plates (160), which are sandwiched between the coils (135) and/or in contact with exterior surfaces of the coils (135). The cold plates (160) may additionally or alternatively be in physical/thermal contact with the transformer core (145). Coolant fluid is pumped through the cold plates (160). In another embodiment, the transformer is (120) is immersed in a coolant fluid (740), such as oil, within a heat management enclosure (710). Cold plates (160) are in physical/thermal contact with the enclosure (710). Coolant liquid (240) pumped through the cold plates (160) conducts heat away from the oil-enclosed transformer (700).

IPC Classes  ?

• H01F 27/12 - Oil cooling
• H01F 27/24 - Magnetic cores
• H01F 27/30 - Fastening or clamping coils, windings, or parts thereof togetherFastening or mounting coils or windings on core, casing, or other support
• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion
• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating
• H02M 7/00 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output

Abstract

A propulsor (1) for a marine vessel is described. The propulsor includes a plurality of blades (4) extending from a rotary housing (2). The blades (4a) are distributed around a blade pitch circle diameter (D1) of the rotary housing. A mounting plate (14) rotatably mounts the rotary housing (2) to a hull (H) of the marine vessel. A slewing bearing (16) includes a driven ring with a driven gear that is fixed to the rotary housing (2) and a stationary ring fixed to the mounting plate (14). A diameter (D2) of the slewing bearing (16) is at least 0.4 times the blade pitch circle diameter (D1). The propulsor (1) includes a main electric motor (28a) with a drive shaft (26a) mechanically connected to a driving gear (24a). The driven gear of the slewing bearing (16) and the driving gear (24a) define a single-stage transmission gear with a transmission ratio between 5:1 and 15:1.

IPC Classes  ?

• B63H 1/10 - Propulsive elements directly acting on water of rotary type with rotation axis substantially at right angles to propulsive direction, e.g. paddle wheels with adjustable vanes or blades with cyclic adjustment with blades extending axially from a disc-shaped rotary body

Abstract

A cyclorotor (1) is described that can be used as a propulsor for a marine vessel. The cyclorotor (1) includes a rotary housing (2) comprising a main body (18) and a plurality of blade modules (16a, 16b,..., 16f) arranged circumferentially around the main body (18). The cyclorotor (1) also includes a plurality of blade assemblies, each blade assembly being located in a respective blade module (16a, 16b,..., 16f) and having a blade (4a, 4b,..., 4f) extending from the rotary housing (2) with a blade axis about which it can be pivoted relative to the rotary housing. Each blade assembly is associated with a blade actuator comprising an electric motor and having a drive shaft, a driving gear mechanically connected to the drive shaft and a driven gear mechanically connected to the respective blade assembly for pivoting the respective blade (4a, 4b,..., 4f) about its blade axis. Each blade module (16a, 16b,..., 16f) is preferably adapted to be detached and removed from the main body (18).

IPC Classes  ?

• B63H 1/10 - Propulsive elements directly acting on water of rotary type with rotation axis substantially at right angles to propulsive direction, e.g. paddle wheels with adjustable vanes or blades with cyclic adjustment with blades extending axially from a disc-shaped rotary body

Abstract

A cooling system (1A) for cooling an item of industrial equipment is described. The cooling system (1A) includes a primary circuit (2) around which a cooling fluid is circulated, and which includes a two-phase heat exchanger (10). A secondary circuit (12) is fluidly connected to the primary circuit (2) in parallel with the heat exchanger (10). The secondary circuit (12) includes a condenser (14), a pump (20), a separator and reservoir tank (22) and a restrictor (28). The boiling point of the cooling fluid at the inlet (10A) of the heat exchanger (10) is reduced by the action of the secondary circuit (10), thereby improving the cooling performance of the cooling system (1A).

IPC Classes  ?

• F25B 23/00 - Machines, plants or systems, with a single mode of operation not covered by groups , e.g. using selective radiation effect
• F25B 25/00 - Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups
• F25D 17/02 - Arrangements for circulating cooling fluidsArrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine

Abstract

A power converter system is described. The power converter system includes a power converter comprising at least one converter unit, each converter unit comprising a plurality of semiconductor devices, each semiconductor device including at least a controllable semiconductor switch. A local controller is associated with at least one converter unit and adapted to receive CD and MD from a main controller. In response to a detected fault condition of the power converter system, the local controller is adapted to use at least one of the one or more locally-stored values to determine an operating state of the power converter system, and to use the determined operating state to select a fault operating procedure to control each associated converter unit according to the selected fault operating procedure without using any CD from the main controller.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/00 - Details of apparatus for conversion
• H02M 7/539 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency

Abstract

A power conversion system for mobile power generation and support is configured to be adaptable to different, time-varying mission requirements, system statuses, environmental contexts, and for different power sources and power loads. Adaptability includes real-time, on-the-fly adaptation from DC-to-AC, AC-to-DC, AC-to-AC, and DC-to-DC conversion; adaptations from buck conversion to boost conversation; and from current source conversion mode to voltage source conversion mode. In an embodiment, individual internal power stages for one or more power electronics building blocks are equipped with multiple internal current routing switches/contactors. Current flow may be dynamically re-routed along different current paths associated with an H-bridge of each power stage. Alternative current routings allow for the introduction or removal of inductors at critical points along the current path. Such on-the-fly current rerouting, at the power transistor level, enables the adaptability of the power converter. Specific open/closed switch settings and specific current routing configurations are presented.

IPC Classes  ?

• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 1/00 - Details of apparatus for conversion
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02M 7/25 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only arranged for operation in series, e.g. for multiplication of voltage

Abstract

A compaction plate for magnetic mass is proposed. The compaction plate comprises a plurality of laminated magnetic sheets, the laminated magnetic sheets being fixed together with fixing and electric insulating means.

IPC Classes  ?

• H02K 1/16 - Stator cores with slots for windings
• H02K 11/33 - Drive circuits, e.g. power electronics
• H02K 1/26 - Rotor cores with slots for windings

Abstract

A doubly-fed induction generator (DFIG) system is described. The DFIG system includes an induction electric machine including a stator having a stator winding and a rotor having a rotor winding. The stator winding is electrically connected to at least one output terminal and the rotor winding is electrically connected to the at least one output terminal by means of a power converter. The power converter includes a first active rectifier/inverter with alternating current AC terminals electrically connected to the rotor winding, and direct current DC terminals, and a second active rectifier/inverter with DC terminals electrically connected to the DC terminals of the first active rectifier/inverter by a DC link, and AC terminals electrically connected to the at least one output terminal. A controller is adapted to control the first active rectifier/inverter so that the frequency of the AC current at its AC terminals is substantially constant during at least one of a “line charging mode” and an “islanded mode”.

IPC Classes  ?

• H02P 9/00 - Arrangements for controlling electric generators for the purpose of obtaining a desired output
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02K 1/16 - Stator cores with slots for windings
• H02K 3/28 - Layout of windings or of connections between windings

Abstract

A power converter system is described. The system includes a power converter with a first converter including a plurality of semiconductor devices. Each semiconductor device includes at least a controllable semiconductor switch having a threshold voltage and a gate voltage for normal on-state conduction. The first converter has first and second DC terminals connected to a DC circuit, and a plurality of AC terminals. A controller is configured to supply current to the first converter (e.g., from an AC power source) and enable a short circuit state of the first converter by controlling semiconductor switches of the first converter to create at least one short circuit path through the first converter that carries the supplied current. At least one of the semiconductor switches in at least one of the short circuit paths is operated with modified on-state conduction in order to increase conduction losses. A gate driver applies to the semiconductor switch a modified gate voltage that is less than the gate voltage for normal on-state conduction.

IPC Classes  ?

• H02M 1/36 - Means for starting or stopping converters
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

A testing process for an electrical system is described. The electrical system includes a power converter and a direct current (DC) bus with two or more DC bus terminals and at least one DC bus capacitor. The testing process is a fully automated testing process where a sequence of different diagnostic tests are carried out on the electrical system, each diagnostic test testing one of the power converter and the DC bus to determine if it is responding as expected or operating within normal parameters.

IPC Classes  ?

• G01R 31/42 - AC power supplies
• G01R 31/34 - Testing dynamo-electric machines
• H02M 1/36 - Means for starting or stopping converters
• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

The rotor with a non-through shaft for a rotary electric machine comprises a cylindrical magnetic body clamped between two half-shafts, each comprising an attachment flange connected to the magnetic body, axial housings being uniformly provided in the magnetic body on at least one diameter of the magnetic body in order to house conductive bars. At least one attachment flange comprises insertion holes, each arranged facing a housing for inserting the conductive bars into the housings and the exterior diameter of the attachment flange is substantially equal to the exterior diameter of the magnetic body, the attachment flange comprising as many insertion holes as housings.

IPC Classes  ?

• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

The conductor bar for a squirrel-cage rotor comprises at least one end which is partially slit such that a section of the end forms two symmetrical branches relative to the slit. The centre of gravity of each branch is arranged such that the branches flare towards the outside of the bar under the effect of centrifugal force when the rotor is rotated.

IPC Classes  ?

• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

This electrical protection system for a DC-current medium-voltage electrical circuit, comprising a disconnection module, for generating a counter-voltage greater than the voltage of the source for a current flowing therethrough that is equal to at most a few percent of the nominal current of the device, a resistive limitation module connected between a first terminal and a second terminal and configured so as to reduce the intensity of the output current of the protection system in order to limit the current between a value and upon a low impedance fault downstream of the device, and a primary switching module coupled in parallel across the disconnection module and the resistive module. The primary switching module is configured so as to switch between a first state in which the primary switching module is conductive and a second state in which the primary switching module forms a short circuit. Control means for controlling the primary switching module are configured so as to switch the primary switching module as soon as the current flowing in the first terminal reaches an upper limit value as lower value or a lower limit as upper value.

IPC Classes  ?

• H02H 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
• H01H 33/59 - Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
• H02H 3/093 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current with timing means

Abstract

The rotor with a non-through shaft for a rotary electric machine comprises a cylindrical magnetic body clamped between two half-shafts, each comprising an attachment flange connected to the magnetic body, axial housings being uniformly provided in the magnetic body on at least one diameter of the magnetic body in order to house conductive bars. At least one attachment flange comprises insertion holes, each arranged facing a housing for inserting the conductive bars into the housings and the exterior diameter of the attachment flange is substantially equal to the exterior diameter of the magnetic body, the attachment flange comprising as many insertion holes as housings.

IPC Classes  ?

• H02K 17/00 - Asynchronous induction motorsAsynchronous induction generators
• H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

and the test subsystem for applying a force on the pod to simulate full scale external loading. The test subsystem comprises a pod actuator interface, an actuator, and an actuator structure interface.

IPC Classes  ?

• G01M 13/025 - Test-benches with rotational drive means and loading meansLoad or drive simulation
• G01L 5/00 - Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes

Abstract

A method of controlling of a polyphase power converter driven by an algorithm of the pulse width modulation type, in which a control parameter comprising a drive setpoint value or a pulse duration associated with a value of drive setpoint of at least one phase, situated in a non-linearity zone of a chart, is modified by modifying the value of said parameter so that it is in a linearity zone of the chart. The control parameter of each of the phases is modified in the same manner.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 7/5395 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
• H02M 5/293 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

This mechanical system for rotating electric machine comprises at least one rotor and at least one transmission shaft for mechanical device. The rotor has a non-through shaft and comprises a cylindrical magnetic block enclosed between a first and a second raised compaction elements forming a rotor shaft, with one end of the transmission shaft being connected directly to the first compaction element.

IPC Classes  ?

• F02C 7/36 - Power transmission between the different shafts of the gas-turbine plant, or between the gas-turbine plant and the power user
• H02K 1/27 - Rotor cores with permanent magnets
• H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines

Abstract

A multi-switch types hybrid power electronics build block (MST HPEBB) least replaceable unit converter employs a first low voltage side (for example, 1000 volt power switches) and a second high voltage side (for example, 3000 volt power switches). The MST HPEBB LRU employs multiple bridge converters connected in series and/or in parallel, and coupled in part by a 1:1 transformer. To reduce weight and volume requirements compared to known PEBB LRUs, different power switch types are employed in different bridge converters. For example, in one exemplary embodiment, low voltage 1.7 kVolt SiC MOSFETS may be employed on the lower voltage side, while at least some 4.5 kVolt Silicon IGBTs may be employed on the high voltage side.

IPC Classes  ?

• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
• H02M 7/53846 - Control circuits
• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

The rotor for an electrical machine with a non-through shaft intended to drive a transmission line comprises two half-shafts enclosing a cylindrical magnetic mass. The magnetic mass comprises at least two adjacent identical cells, the cells being configured to prevent the propagation of metadamping in the rotor over a range of excitation frequencies of the transmission line, the rotation frequency range of the transmission line being hypercritical.

IPC Classes  ?

• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
• H02K 1/22 - Rotating parts of the magnetic circuit
• H02K 17/00 - Asynchronous induction motorsAsynchronous induction generators
• F04B 35/04 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
• G10K 11/162 - Selection of materials
• H02K 1/30 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines

Abstract

A ring for shaft bearing of a marine vehicle drive unit has an annular body and a cylindrical active part intended to provide a sliding contact function with another ring at the bearing level. The cylindrical part is segmented into several cylindrical surfaces, each cylindrical surface being attached in a removable manner to the annular body.

IPC Classes  ?

• F16C 33/04 - BrassesBushesLinings
• F16C 17/10 - Sliding-contact bearings for exclusively rotary movement for both radial and axial load
• F16C 33/26 - BrassesBushesLinings made from wire coilsBrassesBushesLinings made from a number of discs, rings, rods, or other members
• F16C 43/02 - Assembling sliding-contact bearings

Abstract

A method of short-circuiting a faulty submodule for a voltage-source power converter is disclosed. The submodule is based on a full-bridge, asymmetric full-bridge or half-bridge circuit design having power semiconductor switches with anti-parallel freewheeling diodes and optionally non-controllable semiconductor valves. The method 36 includes identifying a faulty semiconductor device and determining a failure mode selected from a short-circuit failure mode and an open circuit failure mode. The method further includes selecting a minimum number of power semiconductor switches suitable to provide a bypass path through the submodule depending on the identified faulty semiconductor device and the determined failure mode and driving the selected power semiconductor switches by a modified driving voltage compared to normal operation to cause them to break down in order to provide a durable, stable, low impedance short-circuit path between the AC voltage terminals of the submodule. A power converter comprising a series connection of such submodules and supporting the method of short-circuiting a faulty submodule is also disclosed.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02H 7/12 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers
• H02H 9/04 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
• H02M 7/219 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
• H02M 7/483 - Converters with outputs that each can have more than two voltage levels
• H02M 1/00 - Details of apparatus for conversion

Abstract

The rotor for a squirrel-cage asynchronous rotating electrical machine comprises two compaction elements clamping a cylindrical magnetic mass, short-circuit rings facing the face of the compaction elements opposite that in contact with the magnetic mass, and conductive bars housed in recesses in the magnetic mass and distributed evenly over at least one diameter of the magnetic mass such that the short-circuit rings and the conductive bars form a squirrel cage. Retaining means distributed over at least one diameter of each short-circuit ring and over at least one diameter of each compaction element interact so as to secure the short-circuit rings and the compaction elements together, the pitch circle diameters of the retaining means on the rings and the compaction elements being smaller than the pitch circle diameter of the conductive bars.

IPC Classes  ?

• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
• H02K 1/28 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
• H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines

Abstract

Provided is a control system (300) for a PV array system (100) including a plurality of PV panels (110, 210). The control system (300) includes a bypass module (250) having a first switch device (260, 310) and a second switch device (262, 312) disposed at least one PV panel (110, 210) connected with others of the plurality of PV panels (110, 210) along a string (200), and configured to perform a switching operation when PV voltage at the at least one PV panel (110, 210) is outside of an acceptable voltage range of the PV array system (100), and the bypass module (250) short-circuits the PV panel (110, 210) when excess voltage at the PV panel (110, 210) is detected. The control system (300) also including a control module (305) configured to monitor and control operation of the bypass module (250).

IPC Classes  ?

• H01L 31/05 - Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
• H01L 31/00 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof
• H01L 31/04 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof adapted as photovoltaic [PV] conversion devices
• H01L 31/042 - PV modules or arrays of single PV cells

Abstract

A doubly-fed induction generator (DFIG) system (100) is described. The DFIG system (100) includes an induction electric machine (102) including a stator having a stator winding and a rotor having a rotor winding. The stator winding is electrically connected to at least one output terminal (108) and the rotor winding is electrically connected to the at least one output terminal (108) by means of a power converter. The power converter includes a first active rectifier/inverter (130a) with alternating current AC terminals electrically connected to the rotor winding, and direct current DC terminals, and a second active rectifier/inverter (136a) with DC terminals electrically connected to the DC terminals of the first active rectifier/inverter by a DC link (138a), and AC terminals electrically connected to the at least one output terminal (108). A controller is adapted to control the first active rectifier/inverter (130a) so that the frequency of the AC current at its AC terminals is substantially constant during at least one of a "line charging mode" and an "islanded mode".

IPC Classes  ?

• H02J 3/00 - Circuit arrangements for ac mains or ac distribution networks
• H02P 9/00 - Arrangements for controlling electric generators for the purpose of obtaining a desired output
• H02P 21/00 - Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation

Abstract

A modular multipoint power converter for converting an AC voltage to a DC voltage or vice versa, and a method of operating it are provided. The multipoint power converter has a converter branches, whereby two converter branches are connected to each other respectively to form a phase branch of the converter. Each converter branch has a plurality of similar submodules, each of which is formed from a half-bridge circuit with power semiconductor switches. The branch currents through the converter branches are controlled in operation by increasing the DC component of the DC current or the DC intermediate circular current such that a unipolar current flows through the converter branches. As a result, with the same plurality of submodules per converter branch, the transmissible power can be increased, the power semi-conductor elements can be better utilized, or the plurality of submodules can be reduced while the transmissible power remains the same.

IPC Classes  ?

• H02M 7/483 - Converters with outputs that each can have more than two voltage levels
• H02M 7/797 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only

Abstract

An active flux control method is described. The active flux control method injects a DC current component into an output transformer (10) that is connected to a power converter in order to reduce the saturation of the output transformer during a network fault. The method includes using a flux controller (20) to derive an estimated magnetisation curve of the output transformer using a closed-loop estimator comprising a flux model (21) and a modelled magnetisation flux (22). A DC component of the estimated magnetisation flux is calculated. Current control is carried out using a current controller (30) that controls the power converter to inject a DC current component into the output transformer. The DC current component is calculated from the DC component of the estimated magnetisation flux.

IPC Classes  ?

• H02M 3/28 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
• H02M 1/40 - Means for preventing magnetic saturation
• H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 1/00 - Details of apparatus for conversion

Abstract

A power converter system (1A) is described. The system includes a power converter (2) with a first converter (2b) including a plurality of semiconductor devices. Each semiconductor device includes at least a controllable semiconductor switch having a threshold voltage and a gate voltage for normal on-state conduction. The first converter (2b) has first and second DC terminals connected to a DC circuit (22), and a plurality of AC terminals. A controller is configured to supply current to the first converter (2b) (e.g., from an AC power source (24)) and enable a short circuit state of the first converter by controlling semiconductor switches of the first converter to create at least one short circuit path through the first converter that carries the supplied current. At least one of the semiconductor switches in at least one of the short circuit paths is operated with modified on-state conduction in order to increase conduction losses. A gate driver applies to the semiconductor switch a modified gate voltage that is less than the gate voltage for normal on-state conduction.

IPC Classes  ?

• H02M 1/36 - Means for starting or stopping converters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 5/458 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 7/5395 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
• H02M 1/00 - Details of apparatus for conversion

Abstract

Provided is an energy storage system for a marine vessel. The energy storage system includes a battery pack and a storage container (i) configured for housing the battery pack and other components and (ii) including an electrical interface for electrically coupling the battery pack to the vessel. The energy storage system also includes an air blast cooling system (i) mountable to a first section of the container and (ii) for cooling the battery pack and an air conditioning system configured for cooling the other components.

IPC Classes  ?

• H01M 10/625 - Vehicles
• H01M 10/613 - Cooling or keeping cold
• H01M 10/6561 - Gases
• H01M 10/663 - Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
• H01M 10/6567 - Liquids
• B63J 99/00 - Subject matter not provided for in other groups of this subclass
• B63H 21/38 - Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
• H01M 50/20 - MountingsSecondary casings or framesRacks, modules or packsSuspension devicesShock absorbersTransport or carrying devicesHolders

Abstract

This electrical protection system (1) for a DC-current medium-voltage electrical circuit, comprising a disconnection module (11), for generating a counter-voltage greater than the voltage of the source for a current flowing therethrough that is equal to at most a few percent of the nominal current of the device, a resistive limitation module (8) connected between a first terminal (B1) and a second terminal (B2) and configured so as to reduce the intensity of the output current of the protection system (1) in order to limit the current between a value VB and VH upon a low-impedance fault downstream of the device, and a primary switching module (5) coupled in parallel across the disconnection module (11) and the resistive module (8). The primary switching module (5) is configured so as to switch between a first state in which the primary switching module is conductive and a second state in which the primary switching module forms a short circuit. Control means (6) for controlling the primary switching module (5) are configured so as to switch the primary switching module (5) as soon as the current flowing in the first terminal (B1) reaches an upper limit value as lower value or a lower limit as upper value.

IPC Classes  ?

• H02H 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
• H01H 33/59 - Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle

Abstract

The mechanical drive system comprises a frame, at least one rotating electric machine comprising an end shaft rotor arranged on the frame, and at least one transfer case having at least one driving gear wheel. The driving gear wheel is integral with a rotor shaft of the rotating electric machine, the transfer case being arranged on the frame.

IPC Classes  ?

• H02K 7/116 - Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
• F04C 23/02 - Pumps characterised by combination with, or adaptation to, specific driving engines or motors
• H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
• F04B 35/04 - Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
• F16H 57/02 - GearboxesMounting gearing therein

Abstract

The invention relates to a mechanical drive system (20) comprising a frame (21), at least one rotating electrical machine (22) having a rotor with a non-through shaft (25) disposed on the frame, and at least one transfer box (23) comprising at least one driving gearwheel (37). The driving gearwheel is secured to a rotor shaft of the rotating electrical machine, the transfer box being disposed on the frame.

IPC Classes  ?

• F16H 1/22 - Toothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members with a plurality of driving or driven shaftsToothed gearings for conveying rotary motion without gears having orbital motion involving more than two intermeshing members with arrangements for dividing torque between two or more intermediate shafts
• H02K 7/116 - Structural association with clutches, brakes, gears, pulleys or mechanical starters with gears
• F16H 57/02 - GearboxesMounting gearing therein

Abstract

The rotor (18) with a non-through shaft for a rotary electric machine comprises a cylindrical magnetic body (19) clamped between two half-shafts (20), each comprising an attachment flange (21) connected to the magnetic body, axial housings (22) being uniformly provided in the magnetic body on at least one diameter (D22) of the magnetic body in order to house conductive bars (25). At least one attachment flange comprises insertion holes (23), each arranged facing a housing for inserting the conductive bars into the housings and the exterior diameter (D21) of the attachment flange is substantially equal to the exterior diameter (D19) of the magnetic body, the attachment flange comprising as many insertion holes (23) as housings.

IPC Classes  ?

• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
• H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines

Abstract

The conductor bar (17) for a squirrel-cage rotor comprises at least one end (17a) which is partially slit such that a section of the end forms two symmetrical branches (22, 23) relative to the slit (21). The centre of gravity (G3, G4) of each branch is arranged such that the branches flare towards the outside of the bar under the effect of centrifugal force when the rotor is rotated.

IPC Classes  ?

• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

The rotor (4) for a squirrel-cage asynchronous rotating electrical machine comprises two compaction elements (6) clamping a cylindrical magnetic mass (7), short-circuit disks (8) inserted between the magnetic mass and the compaction elements, and conductive bars (9) housed in housings (10) of the magnetic mass and evenly distributed over at least one diameter of the magnetic mass, so that the short-circuit disks and the conductive bars form a squirrel-cage, at least one of the compaction elements and the short-circuit disks comprising insertion holes (8a, 12) each disposed facing a housing. Retention means are inserted into each insertion hole to retain the conductive bars in the housings.

IPC Classes  ?

• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

An inverter system is described. The inverter system includes a DC power source such as a plurality of photovoltaic (PV) panels, an inverter and a controller. The inverter includes a plurality of semiconductor devices (e.g., controllable semiconductor switches such as IGBTs and anti-parallel connected diodes) arranged in a suitable inverter topology. The inverter includes DC input terminals connected to the PV panels by means of a DC link and at least one AC output terminal. When starting the inverter, the controller is configured to enable a short circuit state of the inverter by controlling the semiconductor switches to create a short circuit between the DC input terminals such that the inverter carries a current substantially equal to the short circuit current of the PV panels. This short circuit current may be used to pre-heat the semiconductor devices of the inverter to reduce failure rates caused by cosmic radiation when the semiconductor devices subsequently experience high blocking voltages during normal operation of the inverter.

IPC Classes  ?

• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/36 - Means for starting or stopping converters
• H02M 7/487 - Neutral point clamped inverters

Abstract

A system for use with an electric machine is provided. The system includes a processor and a memory comprising a set of memory modules, which, when executed by the processor, cause the processor to perform certain operations. The operations include receiving operational data from the electric machine, and generating, based on the operational data, a first set of diagnostic data, by executing a first memory module from the set of memory modules. The operations further include generating, based on the operational data, a second set of diagnostic data, by executing a second memory module from the set of memory modules, the second memory module including a set of parameters associated with a diagnostics model of the electric machine. Furthermore, the operations include effecting, based on the operational data, the first set of diagnostic data, and the second set of diagnostic data, a change in at least one parameter.

IPC Classes  ?

• G01R 31/56 - Testing of electric apparatus
• G05B 23/02 - Electric testing or monitoring
• G06F 1/28 - Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
• G01R 31/50 - Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
• G06N 3/02 - Neural networks
• G06N 20/20 - Ensemble learning
• G06N 20/00 - Machine learning
• G06N 20/10 - Machine learning using kernel methods, e.g. support vector machines [SVM]

Abstract

An electrical system forming part of a solar power plant (1) is described. The electrical system includes a plurality of photovoltaic (PV) panels (8), a power converter (2), and a controller (54). In response to a detected electric arc on the DC side of the power converter (2), the controller (54) is configured to enable a short circuit state of the power converter by controlling semiconductor switches of the power converter (e.g., turning on some or all of the semiconductor switches) to create a short circuit between DC input terminals (4) of the power converter. The short circuit path though the power converter (2) will extinguish the detected electric arc in the connected DC circuit (10).

IPC Classes  ?

• H02H 1/00 - Details of emergency protective circuit arrangements
• H02H 3/02 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection Details
• H02H 7/122 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers for inverters, i.e. DC/AC converters

Abstract

An inverter system (1) is described. The inverter system (1) includes a DC power source such as a plurality of photovoltaic (PV) panels (8), an inverter (2) and a controller (32). The inverter (2) includes a plurality of semiconductor devices (e.g., controllable semiconductor switches such as IGBTs and anti-parallel connected diodes) arranged in a suitable inverter topology. The inverter (2) includes DC input terminals (4) connected to the PV panels (8) by means of a DC link (10) and at least one AC output terminal (6). When starting the inverter (2), the controller (32) is configured to enable a short circuit state of the inverter (2) by controlling the semiconductor switches to create a short circuit between the DC input terminals (4) such that the inverter (2) carries a current substantially equal to the short circuit current of the PV panels (8). This short circuit current may be used to pre-heat the semiconductor devices of the inverter (2) to reduce failure rates caused by cosmic radiation when the semiconductor devices subsequently experience high blocking voltages during normal operation of the inverter.

IPC Classes  ?

• H02M 7/537 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
• H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
• H02M 7/487 - Neutral point clamped inverters
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/36 - Means for starting or stopping converters
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/40 - Synchronising a generator for connection to a network or to another generator

Abstract

Method of control of a polyphase power converter driven by an algorithm of the pulse width modulation type, in which a control parameter comprising a drive setpoint value or a pulse duration associated with a value of drive setpoint of at least one phase, situated in a non-linearity zone of a chart, is modified (42, 45, 46) by modifying the value of said parameter so that it is in a linearity zone of the chart. The control parameter of each of the phases is modified in the same manner.

IPC Classes  ?

• H02M 7/5395 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
• H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
• H02M 1/00 - Details of apparatus for conversion

Abstract

Provided is a rotor for an asynchronous rotary electrical machine with non-through shaft that includes a cylindrical magnetic mass gripped between two mounting flanges of two half-shafts, a cooling means capable of cooling the rotor and conductive bars housed within the magnetic mass and distributed substantially uniformly over a diameter of the magnetic mass. The cooling means includes, for each conductive bar, at least one cooling channel, opening onto the conductive bar according to an axial direction and located within the magnetic mass and at least one through hole arranged within each conductive bar in such a way that the cooling channel communicates with at least one hole arranged on the outer periphery of the magnetic mass.

IPC Classes  ?

• H02K 9/19 - Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
• H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• H02K 3/24 - Windings characterised by the conductor shape, form or construction, e.g. with bar conductors with channels or ducts for cooling medium between the conductors
• H02K 5/173 - Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
• H02K 9/00 - Arrangements for cooling or ventilating

Abstract

The squirrel-cage rotor (12) for an asynchronous rotating electrical machine comprises two compaction elements (15) clasping a cylindrical magnetic mass (14), short-circuit crowns (16) facing that face of the compaction elements opposite the one in contact with the magnetic mass, and conductive bars (17) housed in recesses in the magnetic mass and distributed uniformly over at least one diameter of the magnetic mass such that the short-circuit crowns and the conductive bars form a squirrel cage. Holding means (19, 20, 21) distributed over at least one diameter of each short-circuit crown and over at least one diameter of each compaction element interact so as to hold the short-circuit crowns and the compaction elements together, the installation diameters of the holding means on the crowns and the compaction elements being smaller than the installation diameter of the conductive bars.

IPC Classes  ?

• H02K 15/00 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
• H02K 5/24 - CasingsEnclosuresSupports specially adapted for suppression or reduction of noise or vibrations
• H02K 1/28 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures

Abstract

Provided is a rotor for an asynchronous electrical machine having an end shaft that includes two half-shafts pressing against a cylindrical magnetic block and two short-circuit discs each placed between one different half-shaft and one of the ends of the cylindrical magnetic block. Each half-shaft includes at least one first means of retention, and each short-circuit disc includes on each of its faces at least one second means of retention and each end of the magnetic block includes at least one third means of retention, the first, second, and third means of retention mating with one another in such a way as to prevent the short-circuit discs from moving relative to the half-shafts and relative to the magnetic block.

IPC Classes  ?

• H02K 1/30 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

The magnetic sheet for rotor with a non-through shaft with no recess at the center thereof is intended to be inserted between two half-shafts of the rotor. It comprises at least one locking means intended to cooperate with adjacent elements so as to prevent a relative movement of said sheet relative to the adjacent elements.

IPC Classes  ?

• H02K 1/30 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies

Abstract

Provided is a rotor for an asynchronous rotating electrical machine that includes a cylindrical magnetic mass, two short-circuit disks, a non-through shaft that includes two half-shafts tightly holding the cylindrical magnetic mass and the two short-circuit disks each sandwiched between the half-shafts and one of the ends of the magnetic mass, and conducting bars housed inside the magnetic mass and distributed uniformly along at least one diameter of the magnetic mass such that the short-circuit disks and the conducting bars form a squirrel cage, and the half-shafts, the short-circuit disks and the magnetic mass form a gas-tight envelope.

IPC Classes  ?

• H02K 1/30 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

The rotor with a non-through shaft for an electrical machine comprises a cylindrical magnetic mass gripped between two half-shafts each comprising a mounting flange connected to the magnetic mass. Each half-shaft is made in a single piece and comprises a coupling flange located opposite the mounting flange.

IPC Classes  ?

• H02K 1/30 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
• H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
• H02K 16/02 - Machines with one stator and two rotors

Abstract

Electrical power distribution system for supplying a set of fixed-frequency loads and a set of variable-frequency loads, includes a set of at least one fixed-frequency AC voltage generator and a set of at least one variable-frequency AC voltage generator, a DC distribution network supplying the variable-frequency loads by means of inverter stages, a first set of rectifier stages connected between the fixed-frequency generators and the distribution network, and a second set of rectifier stages connected between the variable-frequency generators and the DC distribution network. The first set of rectifier stages includes bidirectional rectifiers capable of providing a bidirectional transfer of power and protection means against fault currents connected between the bidirectional rectifiers and the distribution network.

IPC Classes  ?

• H02J 4/00 - Circuit arrangements for mains or distribution networks not specified as ac or dc
• H02J 3/46 - Controlling the sharing of output between the generators, converters, or transformers
• H02J 5/00 - Circuit arrangements for transfer of electric power between ac networks and dc networks

Abstract

An electrical energy storage module is provided. The storage module includes a reversible electrical energy conversion device intended to be connected to an electrical energy source and an electrical energy storage device. The storage device includes a first branch including two filter capacitors in series, and a second branch including two identical electrical energy storage means connected in series. A node common to the two capacitors and a node common to the two energy storage means are coupled by an impedance. A first end of the first and second branches is connected to the electrical energy conversion device, and a second end of the first and second branches is connected to the electrical energy conversion device.

IPC Classes  ?

• H01M 10/44 - Methods for charging or discharging
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• H02M 7/539 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency

Abstract

A transformer having an insulation system is presented. The transformer includes a magnetic core having an opening. Also, the transformer includes a plurality of primary windings disposed extending through the opening of the magnetic core. Further, the insulation system includes a first insulation substantially encapsulating the plurality of primary windings and impregnating spaces between the plurality of primary windings, and a second insulation disposed around the first insulation, where the second insulation has at least one of a predetermined dielectric strength and a predetermined thickness configured to isolate a first voltage signal in the plurality of primary windings from the magnetic core.

IPC Classes  ?

• H01F 27/24 - Magnetic cores
• H01F 27/32 - Insulating of coils, windings, or parts thereof
• H01F 41/12 - Insulating of windings

Abstract

An earthing switch circuit is provided and is connected to a direct current (DC) link including a positive terminal and a negative terminal having capacitance or energy storage capability. The earthing switch circuit includes a dynamic braking circuit having a single or plurality of dynamic braking (DB) switches, and at least one dynamic braking (DB) resistor disposed between the plurality of DB switches, and an earthing switch connected between the DB circuit and ground. The at least one DB resistor dissipates energy thermally when performing a dynamic braking operation and simultaneously decreases in-rush current for the earthing switch circuit upon closure of the earthing switch.

IPC Classes  ?

• H01H 33/59 - Circuit arrangements not adapted to a particular application of the switch and not otherwise provided for, e.g. for ensuring operation of the switch at a predetermined point in the AC cycle
• H02H 3/087 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current for DC applications
• H01H 31/00 - Air-break switches for high tension without arc-extinguishing or arc-preventing means
• H02B 13/075 - Earthing arrangements

Abstract

c).

IPC Classes  ?

• H02K 11/00 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
• H02K 3/51 - Fastening of winding heads, equalising connectors, or connections thereto applicable to rotors only
• H02K 17/16 - Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

Abstract

A method of controlling an operation of a mechanical transmission system includes receiving motor-load data corresponding to the mechanical transmission system. The method further includes receiving, by a digital motor unit, one or more motor input parameters and generating motor parameter estimates of one or more of the plurality of motor parameters. The method also includes receiving, by a digital load unit, one or more motor parameter estimates from the digital motor unit and generating load parameter estimates corresponding to one or more load parameters. The digital motor unit and the digital load unit is a real-time operational model of the motor unit and the load unit respectively. The method also includes controlling the operation of the mechanical transmission system based on one or more of the motor-load data, motor parameter estimates and load parameter estimates.

IPC Classes  ?

• G05B 13/04 - Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
• G05B 23/02 - Electric testing or monitoring
• G07C 3/14 - Quality control systems
• G06N 20/00 - Machine learning

Abstract

A method for controlling operation of an electric power generation system includes receiving power generator data corresponding to the electric power generation system. The method further includes receiving, using a digital prime mover unit, a set-point parameter corresponding to a prime mover unit and generating one or more prime mover parameter estimates corresponding to the plurality of prime mover parameters. Further, the method includes receiving, using a digital generator unit, one or more prime mover parameter estimates and generating one or more generator parameter estimates corresponding to the plurality of generator parameters. The digital prime mover unit and the digital generator unit are real-time operational models of the prime mover unit and the generator unit. The method also includes controlling the operation of the electric power generation system based on at least one or more of the power generator data, the prime mover parameter estimates, and the generator parameter estimates.

IPC Classes  ?

• G05B 13/04 - Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric involving the use of models or simulators
• G05B 23/02 - Electric testing or monitoring
• G07C 3/14 - Quality control systems
• G05B 17/02 - Systems involving the use of models or simulators of said systems electric
• G06Q 10/06 - Resources, workflows, human or project managementEnterprise or organisation planningEnterprise or organisation modelling
• G06N 20/00 - Machine learning

Abstract

A method for controlling operation of transformer system includes receiving, by a controller unit, transformer data corresponding to a transformer. The transformer data includes a plurality of transformer input parameters and a plurality of transformer output parameters. The method further includes receiving, by a digital transformer unit, the plurality of transformer input parameters from the controller unit. The digital transformer unit is a real-time operational model of the transformer. The method also includes generating, by the digital transformer unit, a plurality of transformer output parameter estimates corresponding to the plurality of transformer output parameters. The method further includes controlling operation of the transformer, by the controller unit, based on at least one of the transformer data and the plurality of transformer output parameter estimates.

IPC Classes  ?

• H01F 27/42 - Circuits specially adapted for the purpose of modifying, or compensating for, electric characteristics of transformers, reactors or choke coils
• H01F 27/12 - Oil cooling
• G01R 31/62 - Testing of transformers
• G01R 19/25 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques

Abstract

The hollow rotor shaft for a rotating electrical machine includes two parts. A first part includes a first hollow cylindrical element and a second part includes a second hollow cylindrical element, whereby sections of a first end of the first and second elements are in contact and secured by securing means.

IPC Classes  ?

• H02K 7/00 - Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
• H02K 19/38 - Structural association of synchronous generators with exciting machines
• F16C 3/02 - ShaftsAxles
• H02K 11/042 - Rectifiers associated with rotating parts, e.g. rotor cores or rotary shafts

Abstract

A subsea assembly comprising an electric subsea machine having an electric motor driving an operator, and a coolant circuit at least partially located in thermal contact with the electric motor, the coolant circuit including a cooling assembly located externally from the subsea machine, the cooling assembly comprising at least a heat transfer element, the subsea machine and the cooling assembly being supported by a common supporting frame; at least a part of the heat transfer element is integrated in the frame.

IPC Classes  ?

• H02K 1/12 - Stationary parts of the magnetic circuit
• H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
• H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures

Abstract

A magnetic circuit for a rotary electric machine, a method and an associated electrical machine are described. The magnetic circuit includes an element comprising a plurality of stacks of compacted sheets disposed in an axial direction and clamped between two clamping plates connected by removable retaining bars, where at least one clamping plate includes as many openings as removable retaining bars. The openings of the at least one clamping late and at least one end of each retaining bar are configured to cooperate so that the end of each retaining bar engages a rim of the opening.

IPC Classes  ?

• H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
• H02K 1/06 - Details of the magnetic circuit characterised by the shape, form or construction
• H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• H02K 1/30 - Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders

Abstract

An operating circuit and a method for operating a synchronous machine on a voltage supply network is disclosed. The operating circuit has a converter circuit with controllable converter switches and a controllable switching arrangement to switch the converter circuit between a start converter configuration and a direct converter configuration. The power supply network is connected to a converter output and the synchronous machine is connected to a converter input of the converter circuit. In the direct converter configuration, an AC voltage is provided at the converter output with a preset AC voltage frequency. In the direct converter configuration, the switching of the AC voltage between the converter input and the converter output takes place without intermediate rectification.

IPC Classes  ?

• H02M 5/45 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
• H02M 1/36 - Means for starting or stopping converters
• H02P 1/52 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor by progressive increase of frequency of supply to motor
• H02P 9/08 - Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
• H02M 5/452 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only with automatic control of output waveform
• H02M 5/27 - Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into DC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency
• H02P 27/16 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using AC to AC converters without intermediate conversion to DC
• H02P 9/48 - Arrangements for obtaining a constant output value at varying speed of the generator, e.g. on vehicle

Abstract

There are provided methods and apparatuses for authenticating components in an electric machine. For example, there is provided a method for authenticating parts of an electric machine. The method includes fetching, using a controller, identification data associated with a set of parts and performing a first verification step on the identification data, for each part in the set. The method further includes performing a second verification step on the identification data, in response to the first verification step being successful. The second verification step includes comparing the identification data with data from a database that includes identification information associated with manufactured parts. Furthermore, the method includes, in response to one of the first verification step and the second verification step being unsuccessful, a command to disable the electric machine.

IPC Classes  ?

• G06F 21/31 - User authentication
• G06F 21/36 - User authentication by graphic or iconic representation
• G06F 21/44 - Program or device authentication
• G06F 21/75 - Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information by inhibiting the analysis of circuitry or operation, e.g. to counteract reverse engineering
• G06F 21/73 - Protecting specific internal or peripheral components, in which the protection of a component leads to protection of the entire computer to assure secure computing or processing of information by creating or determining hardware identification, e.g. serial numbers
• G06F 21/62 - Protecting access to data via a platform, e.g. using keys or access control rules

Abstract

A method of controlling a power system that includes an electrical machine, e.g., wind turbine generator, a power converter, a DC circuit and a dynamic braking system (DBS) having a braking circuit having a braking resistor and being connected in series to the DC circuit, is provided. The method includes operating the DBS and controlling operation of the electrical machine based on a prevailing temperature of the braking circuit, stopping the electrical machine and controlling the electrical machine to be restarted at its rated output power once the prevailing temperature of the braking resistor reaches or falls below a lower temperature threshold. The electrical machine may be restarted at a lower output power and after restarting, its output power can be increased based on a power starting profile as the braking resistor cools.

IPC Classes  ?

• H02P 9/08 - Control of generator circuit during starting or stopping of driving means, e.g. for initiating excitation
• H02P 9/00 - Arrangements for controlling electric generators for the purpose of obtaining a desired output
• H02P 3/22 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking
• F03D 7/02 - Controlling wind motors the wind motors having rotation axis substantially parallel to the air flow entering the rotor
• H02K 7/18 - Structural association of electric generators with mechanical driving motors, e.g.with turbines
• H02M 7/04 - Conversion of AC power input into DC power output without possibility of reversal by static converters
• H02P 9/02 - Arrangements for controlling electric generators for the purpose of obtaining a desired output Details
• H02P 101/15 - Special adaptation of control arrangements for generators for wind-driven turbines

Abstract

A method and a device for controlling a commutation process of a load current between two switching modules are disclosed that each have a MOSFET that can be controlled by a gate-source voltage, and an intrinsic-body inverse diode. To reduce oscillations in the down-commutation of the inverse diodes caused by parasitic circuit parameters, after switching off one of the switching modules, the gate-source control voltage applied to this switching module is temporarily switched off until being increased again the vicinity of the threshold voltage for switching on the MOSFET, before and while the other switching module is switched on, in order to commutate the current from the inverse diode of the one switching module to the MOSFET of the other switching module.

IPC Classes  ?

• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H03K 17/16 - Modifications for eliminating interference voltages or currents
• H02M 7/538 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
• H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• H03K 17/687 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of semiconductor devices the devices being field-effect transistors
• H02M 1/00 - Details of apparatus for conversion

Abstract

The disclosed assembly (E) comprises a housing (4) and a stator (29) inserted inside a cylindrical cavity in said housing (4). Said assembly comprises a means for point-to-point attachment (40, 46) of the stator (29) to the housing (4).

IPC Classes  ?

• H02K 1/18 - Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
• H02K 5/04 - Casings or enclosures characterised by the shape, form or construction thereof
• H02K 15/02 - Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies

Abstract

This power system for mounting on a marine vehicle includes a propulsion unit, means for securing the propulsion assembly to a hull element of the vehicle and a rudder bearing mechanically connecting the propulsion unit with the fittings. The fittings are configured so that once the power system is mounted on the hull element; the plane of the rudder bearing is inclined relative to a plane containing one longitudinal axis and one transverse axis of the marine vehicle.

IPC Classes  ?

• B63H 5/125 - Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction
• F16C 19/10 - Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for axial load mainly
• F16C 19/30 - Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for axial load mainly
• F16C 35/04 - Rigid support of bearing unitsHousings, e.g. caps, covers in the case of ball or roller bearings

Abstract

There is provided a system that includes a processor. The system also includes a memory that stores instructions; when executed by the processor, the instructions configure the processor to perform certain operations. The operations include receiving sensor measurements from an electric power source or device and generating, based on the sensor measurements, a droop control procedure that includes a droop control curve having a non-constant slope. The operations further include regulating a power delivery from the electric power source or device to a bus according to the droop control procedure.

IPC Classes  ?

• G05B 15/02 - Systems controlled by a computer electric
• H02J 4/00 - Circuit arrangements for mains or distribution networks not specified as ac or dc
• H02J 3/28 - Arrangements for balancing the load in a network by storage of energy
• H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
• H02J 3/32 - Arrangements for balancing the load in a network by storage of energy using batteries with converting means
• G05B 19/042 - Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors