Abrégé

Provided are a braking temperature control method and system for an electromechanical brake. In the braking temperature control method for an electromechanical brake provided by the present disclosure, an intermediate temperature is obtained based on temperatures acquired by thermistors mounted on a stator winding, and a braking temperature control solution is generated based on a relationship between the intermediate temperature and a preset temperature, to control the heating of an electromechanical braking (EMB) driving motor. Therefore, under a conventional temperature control strategy, the operating environment of the EMB driving motor can be effectively improved, and the EMB efficiency is ensured. In addition, in a high-temperature abnormal operating state of the EMB driving motor, the operating temperature of the driving motor can be effectively controlled through a braking force redistribution strategy, thereby avoiding the braking failure caused by motor overheating.

Classes IPC  ?

• H02P 29/64 - Commande ou détermination de la température de l’enroulement
• B60T 8/172 - Détermination des paramètres de commande utilisés pour la régulation, p. ex. par des calculs impliquant des paramètres mesurés ou détectés
• B60T 8/1755 - Régulation des freins spécialement adaptée pour la commande de la stabilité du véhicule, p. ex. en tenant compte du taux d'embardée ou de l'accélération transversale dans une courbe
• B60T 17/22 - Dispositifs pour surveiller ou vérifier les systèmes de freinsDispositifs de signalisation
• F16D 65/78 - Caractéristiques relatives au refroidissement

Abrégé

A configuration control method for an electronic mechanical brake-by-wire system is Provided. The control method includes: acquiring a first actual output torque measured by the first torque sensor and a second actual output torque measured by the second torque sensor; if a received signal is a brake loading signal, separately comparing a first difference with an initial torque difference and a maximum torque difference when a motor fails to obtain a comparison result, where the first difference is an absolute value of a difference between the first actual output torque and the second actual output torque; and controlling the first motor and the second motor according to the comparison result to complete brake loading by means of the brake actuator. Also provided is a configuration control system for an electronic mechanical brake-by-wire system. The control method and the control system can achieve synchronous and precise control of a brake force.

Classes IPC  ?

• B60T 13/74 - Transmission de l'action de freinage entre l'organe d'attaque et les organes terminaux d'action, avec puissance de freinage assistée ou relais de puissanceSystèmes de freins incorporant ces moyens de transmission, p. ex. systèmes de freinage à pression d'air avec entraînement ou assistance électrique
• B60T 17/22 - Dispositifs pour surveiller ou vérifier les systèmes de freinsDispositifs de signalisation

Abrégé

The present invention relates to an automatic driving vehicle navigation control method and system. The method comprises performing navigation by means of an optimized navigation model according to vehicle and environment state data. A training process comprises: determining a vehicle control quantity by means of a navigation control algorithm according to point cloud data of an obstacle; constructing a navigation model by means of a DRL decision network according to the vehicle control quantity and the vehicle and environment state data, wherein the DRL decision network comprises: a DRL Actor network for outputting a first vehicle control quantity according to the vehicle and environment state data and the vehicle control quantity, and a DRL Critic network for outputting, according to the first vehicle control quantity, the vehicle control quantity, and the vehicle and environment state data, expected returns corresponding to the two groups of vehicle control quantities, and determining and outputting a final control quantity; and optimizing the navigation model by using a reward and punishment mechanism. The present invention can improve the precision of automatic driving navigation control of a DRL mode, increase the convergence speed in neural network training, and reduce the convergence difficulty in neural network training.

Classes IPC  ?

• G05D 1/02 - Commande de la position ou du cap par référence à un système à deux dimensions

Abrégé

The present invention relates to a braking temperature control method and system for an electromechanical brake. According to the braking temperature control method for the electromechanical brake (EMB) provided by the present invention, an intermediate temperature is obtained on the basis of a temperature obtained by a thermistor mounted on a stator winding, and a braking temperature control scheme is generated according to the relationship between the intermediate temperature and a preset temperature, so as to control the heating of a drive motor of the EMB. Therefore, under a conventional temperature control strategy, the working environment of the drive motor in the EMB can be effectively improved, thus ensuring the braking efficiency of the EMB. Moreover, in a high-temperature abnormal working state of the drive motor in the EMB, the working temperature of the drive motor can be effectively controlled by means of a braking force redistribution strategy, thus preventing braking failure caused by the overheating of the motor.

Classes IPC  ?

• H02P 29/64 - Commande ou détermination de la température de l’enroulement
• H02K 11/25 - Dispositifs pour détecter la température ou actionnés par des valeurs de cette variable
• H02K 9/04 - Dispositions de refroidissement ou de ventilation par l'air ambiant s'écoulant à travers la machine comportant des moyens pour établir la circulation d'un agent de refroidissement
• B60L 7/00 - Systèmes de freins électrodynamiques pour véhicules, en général

Abrégé

The present invention relates to the technical field of electronic brakes. Disclosed are an electronic mechanical brake having an active heat dissipation function, and a commercial vehicle comprising same. The electronic mechanical brake comprises a brake body and a heat dissipation apparatus; the brake body comprises a motor driving apparatus and an ejecting head; the motor driving apparatus comprises a stator assembly, a rotor assembly, and a rotating shaft; the rotor assembly is provided at an inner ring of the stator assembly; the rotating shaft is fixed to an inner ring of the rotor assembly; the ejecting head is in threaded connection to one end of the rotating shaft; the heat dissipation apparatus is provided at the outer side of the stator assembly; the heat dissipation apparatus comprises a gravity heat pipe; the gravity heat pipe is provided at an outer ring of the stator assembly; a heat pipe heat dissipation apparatus is provided above the gravity heat pipe. The commercial vehicle further comprises a vehicle body; wheels are provided with electronic mechanical brakes having the active heat dissipation function; the vehicle body is provided with a vehicle control unit and four brake control units; and the four brake control units are respectively electrically connected to four electronic mechanical brakes having the active heat dissipation function. The present invention can realize a heat dissipation effect on the stator assembly.

Classes IPC  ?

• H02K 9/20 - Dispositions de refroidissement ou de ventilation pour machines avec enveloppe fermée et circuit fermé de refroidissement utilisant un agent de refroidissement liquide, p. ex. de l'huile dans lesquels l'agent de refroidissement se vaporise dans l'enveloppe de la machine
• F16D 65/14 - Mécanismes d'actionnement pour freinsMoyens pour amorcer l'opération de freinage à une position prédéterminée

Abrégé

The present invention relates to the field of electric vehicle charging load prediction, and relates to an electric vehicle charging load prediction method and system. The method comprises: acquiring electric vehicle travel rules, and fitting travel rule probability distribution characteristic parameters according to the electric vehicle travel rules; fitting electric vehicle charging characteristics according to the electric vehicle travel rules of a plurality of electric vehicles; determining electric vehicle parameters according to the actual number of electric vehicles in a region; determining random travel data according to the electric vehicle parameters, converting the random travel data into a multi-dimensional normal distribution function, and generating a travel rule random number containing coupling characteristics; and according to the electric vehicle travel rules, the charging characteristics, and the travel rule random number containing coupling characteristics, establishing a simulation model of variable bandwidth kernel density estimation by using a variable bandwidth kernel density function, and determining an optimal charging load simulation curve. The present invention improves the precision of electric vehicle charging load prediction.

Classes IPC  ?

• G06Q 10/04 - Prévision ou optimisation spécialement adaptées à des fins administratives ou de gestion, p. ex. programmation linéaire ou "problème d’optimisation des stocks"

Abrégé

A method and system for cooperative control of vehicles at an intersection without a traffic light. The method for the cooperative control of the vehicles at the intersection without the traffic light comprises: obtaining vehicle information of each vehicle (step 101); constructing an action value network model (step 102); inputting the vehicle information into the action value network model, and outputting an action evaluation value of each vehicle in a current state (step 103); constructing a hybrid network model (step 104); inputting the action evaluation value and state information of all the vehicles into the hybrid network model to obtain an output of the hybrid network model (step 105); on the basis of the output of the hybrid network model and the action evaluation value, training the action value network model by using a contribution degree distribution mechanism module based on a Shapley value to obtain a trained action value network model (step 106); and determining the action of each vehicle at the next moment on the basis of the trained action value network model and a ∈-greedy strategy (step 107).

Classes IPC  ?

• G08G 1/07 - Commande des signaux de trafic

Abrégé

Provided in the present invention is an electro-mechanical braking mechanism, relating to the technical field of braking structures, and comprising: an electric motor, a harmonic reducing mechanism and a push rod mechanism. The electric motor comprises an electric motor housing, and a rotor, a stator and a rotating shaft which are sequentially arranged in the electric motor housing from outside to inside, the rotor is fixedly connected to the rotating shaft, an end of the rotating shaft is rotatably connected to a rear end cover of the electric motor housing around the axis of the rotating shaft, the harmonic reducing mechanism is also arranged in the electric motor housing, the rotating shaft on a side of the rotor facing away from the rear end cover of the electric motor housing is inserted into a torque input end on a side of the harmonic reducing mechanism, to achieve transmission connection between the rotor and the harmonic reducing mechanism, the push rod mechanism is fixedly arranged on a torque output surface at the other side of the harmonic reducing mechanism, and the harmonic reducing mechanism is configured to drive the push rod mechanism to push a lever thrust arm of a brake caliper. The electro-mechanical braking mechanism disclosed in the present invention is oriented to the braking characteristics of commercial vehicles, and has the advantages of a large output rotating moment, a large axial bearing capacity, a high coupling degree between mechanisms, a compact overall layout and small space occupation.

Classes IPC  ?

• H02K 7/102 - Association structurelle avec des embrayages, des freins, des engrenages, des poulies ou des démarreurs mécaniques avec des freins à friction
• H02K 7/116 - Association structurelle avec des embrayages, des freins, des engrenages, des poulies ou des démarreurs mécaniques avec des engrenages

Abrégé

The present invention relates to a low-voltage large-current wireless charging system and a cooperative control method thereof, and belongs to the technical field of wireless charging. A first control module and a second control module are connected and perform primary and secondary-side data and information bidirectional interaction in a wireless mode. The first control module controls the shoot-through duty ratio of a quasi-Z-source inverter circuit, so that a load battery pack is charged at constant power. The second control module controls a synchronous rectification duty ratio, so that the equivalent load resistance of a current-multiplying synchronous rectification circuit tracks in real time the optimal system load, ensuring that the system always works at the maximum efficiency point. By means of primary and secondary-side cooperative control, constant power and maximum-efficiency tracking control are achieved, thus improving system efficiency and reducing on-state losses of system components.

Classes IPC  ?

• H02J 50/12 - Circuits ou systèmes pour l'alimentation ou la distribution sans fil d'énergie électrique utilisant un couplage inductif du type couplage à résonance

Abrégé

A configuration control method for an electronic mechanical brake-by-wire system, for a dual-synchronous motor electronic mechanical brake-by-wire system configuration. An output shaft of a first motor in the configuration is connected to a first torque sensor; an output shaft of a second motor is connected to a second torque sensor; the first torque sensor and the second torque sensor are both electrically connected to an electric control unit; output shafts of the first torque sensor and the second torque sensor are both connected to a brake actuator. The control method comprises: acquiring a first actual output torque measured by the first torque sensor and a second actual output torque measured by the second torque sensor; if the received signal is a brake loading signal, respectively comparing a first difference value with an initial torque difference and a maximum torque difference when a motor fails to obtain a comparison result, the first difference value being the absolute value of the difference value between the first actual output torque and the second actual output torque; and controlling the first motor and the second motor according to the comparison result so as to complete brake loading by means of the brake actuator. Also disclosed is a configuration control system for an electronic mechanical brake-by-wire system. The control method and the control system can realize synchronous accurate control of a braking force.

Classes IPC  ?

• F16D 65/14 - Mécanismes d'actionnement pour freinsMoyens pour amorcer l'opération de freinage à une position prédéterminée
• B60T 13/74 - Transmission de l'action de freinage entre l'organe d'attaque et les organes terminaux d'action, avec puissance de freinage assistée ou relais de puissanceSystèmes de freins incorporant ces moyens de transmission, p. ex. systèmes de freinage à pression d'air avec entraînement ou assistance électrique

Abrégé

Disclosed in the present invention are a method and a system for determining a turn-off current of an MOSFET in a wireless charging system. The method comprises: determining a voltage load parameter of a composite compensation network topology structure in a wireless charging system; determining an impedance parameter and a capacitance parameter of the composite compensation network topology structure, and an impedance angle of a high frequency inverter; calculating a fundamental wave of an output current of the high frequency inverter according to the impedance parameter, the capacitance parameter, and the impedance angle; determining a turn-off current according to the fundamental wave of the output current of the high frequency inverter to obtain a first turn-off current; determining an input impedance of the wireless charging system when the high-order harmonic is considered; calculating a turn-off current according to the voltage load parameter and the input impedance of the wireless charging system when the high-order harmonic is considered, to obtain a second turn-off current; and determining a turn-off current of an MOSFET in the wireless charging system according to the first turn-off current and the second turn-off current. According to the present invention, the turn-off current can be accurately determined while reducing the computational complexity.

Classes IPC  ?

• H02J 7/00 - Circuits pour la charge ou la dépolarisation des batteries ou pour alimenter des charges par des batteries
• H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
• H02J 50/12 - Circuits ou systèmes pour l'alimentation ou la distribution sans fil d'énergie électrique utilisant un couplage inductif du type couplage à résonance

Abrégé

The present invention specifically relates to the field of wireless charging. Disclosed are a method and system for constructing a driver circuit of a wireless charging system. The method comprises: calculating a negative bridge arm crosstalk voltage of another SiC MOSFET complementary to one SiC MOSFET when the SiC MOSFET in a bridge arm crosstalk analysis topology is turned off, the bridge arm crosstalk analysis topology comprising a direct current power supply, a high frequency inverter, a primary side compensation capacitor, a loose coupling transformer, a secondary side compensation capacitor, a rectifier, and a load which are connected in sequence; the high frequency inverter comprising four SiC MOSFET structures; and setting a forward bridge arm crosstalk voltage of another SiC MOSFET complementary to one SiC MOSFET to zero when the SiC MOSFET is turned off, and constructing a driver circuit of a wireless charging system according to the negative bridge arm crosstalk voltage. According to the present invention, the complexity of the circuit can be reduced, and the reliability of driving power supply is improved.

Classes IPC  ?

• H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs

Abrégé

A high-order model parameter identification method and system suitable for a lithium-rich manganese-based battery. The high-order model parameter identification method suitable for a lithium-rich manganese-based battery comprises: on the basis of the characteristics of a lithium-rich manganese-based battery, establishing an equivalent circuit model, which is suitable for the lithium-rich manganese-based battery, and which equivalently simulates an open-circuit voltage of the lithium-rich manganese-based battery by means of an ideal voltage source, equivalently simulates a resistance characteristic of the voltage of the lithium-rich manganese-based battery by means of internal resistance, and equivalently simulates a polarization effect of the lithium-rich manganese-based battery by means of an RC inertia element (100); and then performing identification by using the equivalent circuit model to obtain a high-order model parameter, which is suitable for the lithium-rich manganese-based battery (200). Therefore, the overall high-order model parameter identification method has the characteristics of good universality and a high practical value, and parameter identification precision is also improved.

Classes IPC  ?

• G01R 31/382 - Dispositions pour la surveillance de variables des batteries ou des accumulateurs, p. ex. état de charge

Abrégé

The present invention belongs to the technical field of rotary rectification of electric motors, aims to solve the problem that existing rotary rectifiers cannot meet the requirements of safe operation under high-speed and large-current conditions, and specifically relates to a rotary rectifier suitable for high-speed and heavy-current conditions. The rotary rectifier comprises a housing, a rectifier element, a copper busbar, and an insulating component, wherein the copper busbar comprises a phase-A copper bar, a phase-B copper bar, a phase-C copper bar, an excitation positive copper bar, and an excitation negative copper bar; the insulating component comprises a phase-A copper bar insulator, a phase-B copper bar insulator, a phase-C copper bar insulator, an excitation positive copper bar insulator, and an excitation negative copper bar insulator; and the rectifier element comprises a phase-A diode, which is arranged between the phase-A copper bar and the excitation negative copper bar, a phase-B diode, which is arranged between the phase-B copper bar and the excitation positive copper bar, and a phase-C diode, which is arranged between the excitation positive copper bar and the phase-C copper bar. The rotary rectifier of the present invention has high integration and a compact structure, effectively ensuring the safe operation thereof.

Classes IPC  ?

• H02M 7/00 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continuTransformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif

Abrégé

The present application provides a method of designing a high shielding gradient coil for a planar superconducting magnetic resonance imaging (MRI) system and a gradient coil thereof, the method determines a shielding area according to an outer profile of a metal conductor around the position of the gradient coil in the planar superconducting MRI system, and performs partitioned shielding of a stray field. The constraint values of stray fields at different partitioned zones of the shielding area are adjusted according to the shielding requirements. The primary coils of both the transverse gradient coil and the longitudinal gradient coil optimized by the design method of the high shielding gradient coil contain a reverse coil, which generates a magnetic field that offsets leakage magnetic field of other coils, thus achieving the purpose of reducing the stray field of the gradient coil.

Classes IPC  ?

• G01R 33/421 - Blindage du champ magnétique principal ou du champ magnétique à gradient
• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• G01R 33/385 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des bobines de champ magnétique à gradient

Abrégé

A high-voltage isolation withstand planar transformer and its high-voltage insulation method are provided. An insulating medium is provided between low-voltage windings and high-voltage windings. High-frequency current flows through the windings and generates a high-frequency alternating magnetic field to achieve isolated energy transmission. The low-voltage windings are connected to low-voltage side connection terminals, and the high-voltage windings are connected to high-voltage side connection terminals through a high-voltage winding leading-out foil. An annular hollow part of the low-voltage windings and the high-voltage windings is provided with a magnetic core. A stress grading method is provided to control the distribution of the electric field around the high-voltage winding leading-out foil. A voltage-balancing element group provides a voltage potential with a gradient change between the high-voltage winding leading-out foil and the low-voltage windings. The new transformer has small size, high power density and low cost.

Classes IPC  ?

• H01F 5/00 - Bobines d'induction
• H01F 27/32 - Isolation des bobines, des enroulements, ou de leurs éléments
• H01F 27/28 - BobinesEnroulementsConnexions conductrices
• H01F 27/29 - BornesAménagements de prises
• H01F 27/36 - Blindages ou écrans électriques ou magnétiques
• H01F 30/06 - Transformateurs fixes non couverts par le groupe caractérisés par la structure

Abrégé

The present invention relates to the technical field of direct current transformers, and specifically relates to a three-phase CLLC bidirectional direct current transformer and a control method therefor, for solving the problems of existing modular high-voltage side series connection and low-voltage side parallel connection structures having a large number of modules and low reliability, and existing multilevel technology-based transformer circuits having complex circuit topology, uneven capacitance voltage division, and high clamp tube voltage stress. The invention comprises: a high-voltage side voltage division capacitor module comprising three voltage division capacitors; a three-phase half bridge series/parallel connection module comprising three series/parallel connected bridge arms, each bridge arm comprising two switches connected in series; a three-phase primary/secondary resonant module comprising a, b, and c three-phase primary/secondary resonant cavities; a three-phase isolation transformer comprising three a, b, and c single-phase transformers; and a low-voltage side capacitor module. The present invention reduces clamp tube voltage stress by means of the voltage division capacitors implementing high-voltage side voltage division, and reduces switch loss by means of high-frequency soft-switching technology, increasing the efficiency and power density of the transformer.

Classes IPC  ?

• H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
• H02M 7/48 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande

Abrégé

This invention proposes a three-phase CLLC bidirectional DC-DC converter, which includes a high-voltage side voltage dividing capacitor module, a three-phase half-bridge series module, a three-phase half-bridge parallel module, a three-phase primary/secondary side resonant module, a three-phase isolation transformer and a low-voltage side capacitor module. The high-voltage side voltage dividing capacitor module includes three voltage dividing capacitors. The three-phase half-bridge series/parallel module includes three bridge arms connected in series/parallel. Each bridge arm includes two switches connected in series. The three-phase primary/secondary side resonant module includes a, b, c three-phase primary/secondary side resonant tank. The three-phase isolation transformer includes three single-phase transformers a, b, and c. The voltage of the high-voltage side is divided through the voltage dividing capacitors to reduce the voltage stress of the switches, and the switching loss is diminished via the high-frequency soft switching technology.

Classes IPC  ?

• H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
• H02M 3/00 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu
• H02M 1/00 - Détails d'appareils pour transformation

Abrégé

A high-shielding gradient coil design method for a planar superconducting magnetic resonance system, and a gradient coil thereof. A shielding region is determined according to an outer contour of a metal conductor around the position where a gradient coil is located in a planar superconducting magnetic resonance system, shielding is performed on stray fields in a partitioned manner, and constraint values of the stray fields at different partitions of the shielding region are adjusted according to shielding requirements. Main coils of a transverse gradient coil and a longitudinal gradient coil designed by using a high-shielding gradient coil design method comprise a reverse coil, and a magnetic field generated by the reverse coil offsets a leakage magnetic field of the other coils, achieving the purpose of reducing stray fields of the gradient coil.

Classes IPC  ?

• G01R 33/385 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des bobines de champ magnétique à gradient
• A61B 5/055 - Détection, mesure ou enregistrement pour établir un diagnostic au moyen de courants électriques ou de champs magnétiquesMesure utilisant des micro-ondes ou des ondes radio faisant intervenir la résonance magnétique nucléaire [RMN] ou électronique [RME], p. ex. formation d'images par résonance magnétique

Abrégé

A large-scale photovoltaic direct current (DC) series boost grid-connected system with a power balancer, including N photovoltaic DC converters and N−1 power balancers, wherein N≥2. The output ends of the photovoltaic DC converters are connected successively in series and then connected to the DC grid, and the input ends of the photovoltaic DC converters are respectively connected to the output ends of the photovoltaic power generation unit. Among the photovoltaic DC converters, which are arranged successively in series, a power balancer is disposed between the input ends of two photovoltaic DC converters adjacent to each other. The N−1 power balancers are arranged corresponding to the set N−1 photovoltaic DC converters respectively to balance the input power of the corresponding photovoltaic DC converter, thereby eliminating a difference between the output voltages of the photovoltaic DC converters.

Classes IPC  ?

• H02J 1/14 - Équilibrage de la charge dans un réseau
• H02S 40/30 - Composants électriques

Abrégé

A large-scale photovoltaic direct-current series boosting grid-connected system having power balancers, and a power balancing method. The grid-connected system comprises N photovoltaic direct-current converters (103) and N-1 power balancers (102), N≥2; output ends of the photovoltaic direct-current converters are sequentially connected in series and then connected to a direct-current grid (105), and input ends of the photovoltaic direct-current converters are respectively connected to output ends of photovoltaic power generation units (101); in the photovoltaic direct-current converters which are sequentially provided in series, a power balancer is provided between input ends of two adjacent photovoltaic direct-current converters; and the N-1 power balancers are respectively provided corresponding to the provided N-1 photovoltaic direct-current converters, and are used for performing power equalization on inputs of corresponding photovoltaic direct-current converters, so as to eliminate differences in output voltages of the photovoltaic direct-current converters. The grid-connected system solves the problems of light abandonment and overvoltage output of the photovoltaic direct-current converters caused by mismatching of input powers of the photovoltaic direct-current converters in said system, improving the generating capacity of said system.

Classes IPC  ?

• H02J 1/10 - Fonctionnement de sources à courant continu en parallèle

Abrégé

1013455, for adjusting the secondary circuit into a voltage multiplication circuit, so as to double the output voltage of the high-frequency transformer. According to the present invention, there is no need to pre-charge an output capacitor, entering a buck mode from zero voltage and gradually transitioning to a boost mode achieves a soft start, and adjusting a topological boosting ratio over a wide range realizes the matching of an input voltage and an output voltage.

Classes IPC  ?

• H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
• H02J 1/10 - Fonctionnement de sources à courant continu en parallèle

Abrégé

An intelligent liquid helium-free whole-body magnetic resonance imaging superconducting magnet system, comprising: a vacuum container, provided with a main magnetic field superconducting coil in a radially inner side position therein, and a shielding superconducting coil in a radially outer side position therein, and a heat pipe gas tank is arranged in a vacant area between the main magnetic field superconducting coil and the shielding superconducting coil; a liquid helium reservoir, communicated with a liquid-gas storage tank, and connected with the main magnetic field superconducting coil or the shielding superconducting coil via a helium self-oscillation heat pipe; a refrigerator, fixed on the vacuum container through a thermal conduction component auto-pluggable component; the first thermal conduction component connected with the refrigerator is in close contact with the thermal radiation screen assembly, and the second thermal conduction component connected with the refrigerator is in close contact with the liquid helium reservoir.

Classes IPC  ?

• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient
• H01F 6/04 - Refroidissement

Abrégé

5 adjusts the secondary side circuit into a voltage multiplication circuit to double the output voltage of the high-frequency transformer.

Classes IPC  ?

• H02M 3/335 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant continu avec transformation intermédiaire en courant alternatif par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrodes de commande pour produire le courant alternatif intermédiaire utilisant des dispositifs du type triode ou transistor exigeant l'application continue d'un signal de commande utilisant uniquement des dispositifs à semi-conducteurs
• H02M 1/34 - Circuits d'amortissement
• H02J 3/38 - Dispositions pour l’alimentation en parallèle d’un seul réseau, par plusieurs générateurs, convertisseurs ou transformateurs

Abrégé

A control method for a series hybrid power system or synergic electric power supply and a control device thereof are disclosed. The control device includes: a generator reference current value generating module and a generator current control module. The generator reference current value generating module is configured to generate a reference current value of a generator according to an actual current value of an energy storage device, a reference current value of the energy storage device, an actual voltage value of a DC bus, and a reference voltage value of the DC bus. The generator current control module is configured to generate a control signal of a rectifier according to the reference current value of the generator, the actual value of any two-phase current of the generator, and an actual angular velocity of the generator, thereby controlling the series hybrid power system or the synergic electric power supply.

Classes IPC  ?

• B60L 58/14 - Procédés ou agencements de circuits pour surveiller ou commander des batteries ou des piles à combustible, spécialement adaptés pour des véhicules électriques pour la surveillance et la commande des batteries en fonction de l'état de charge [SoC] empêchant les décharges excessives
• H02M 7/04 - Transformation d'une puissance d'entrée en courant alternatif en une puissance de sortie en courant continu sans possibilité de réversibilité par convertisseurs statiques
• B60L 58/15 - Procédés ou agencements de circuits pour surveiller ou commander des batteries ou des piles à combustible, spécialement adaptés pour des véhicules électriques pour la surveillance et la commande des batteries en fonction de l'état de charge [SoC] empêchant les surcharges
• B60L 50/61 - Propulsion électrique par source d'énergie intérieure au véhicule utilisant de la puissance de propulsion fournie par des batteries ou des piles à combustible utilisant de l'énergie fournie par des batteries par des batteries chargées par des générateurs entraînés par le moteur, p. ex. des véhicules électriques hybrides du type série

Abrégé

Provided is a gravity gradient measurement apparatus and measuring method, wherein a turntable rotates horizontally around an earth-vertical axis, a vacuum layer is arranged on the turntable defining a first chamber, a first three-axis accelerometer and a second three-axis accelerometer are located in the first chamber, the first three-axis accelerometer and the second three-axis accelerometer are arranged symmetrically on an x axis with respect to an origin of coordinates. Both the first three-axis accelerometer and the second three-axis accelerometer have a distance of R from the origin of coordinates. The first three-axis accelerometer and the second three-axis accelerometer are arranged symmetrically on an z axis with respect to the origin of coordinates, and the first three-axis accelerometer and the second three-axis accelerometer are spaced at a distance of h on the z axis. The measurement module uses measurements of the accelerometers to determine gravity gradients on the coordinate axes.

Classes IPC  ?

• G01V 7/02 - Mesure de champs ou d'ondes de gravitationProspection ou détection gravimétrique Détails
• G01V 13/00 - Fabrication, étalonnage, nettoyage ou réparation des instruments ou dispositifs couverts par les groupes
• H05K 9/00 - Blindage d'appareils ou de composants contre les champs électriques ou magnétiques

Abrégé

3/g. The method for preparing a graphene in the present invention is simple and easy to carry out, and has a low cost and a high yield; and the graphene product has few impurities, a high carbon-oxygen ratio, and excellent capacitance performance and electrochemical stability.

Classes IPC  ?

• C01B 32/184 - Préparation

Abrégé

An intelligent liquid helium-free magnetic resonance whole body imaging superconducting magnet system, comprising: a vacuum container (8), a main magnetic field superconducting coil (1) being disposed in a radial inner side space within the vacuum container, and a shielding magnetic field superconducting coil (2) being disposed in a radial outer space within the vacuum vessel, wherein a heat pipe gas storage tank (4) is placed in a vacant area between the main magnetic field superconducting coil and the shielding magnetic field superconducting coil; a helium liquid storage box (5), which is in communication with a liquid storage box gas storage tank (6) while being connected to the main magnetic field superconducting coil or the shielding magnetic field superconducting coil by means of a helium self-excited oscillation heat pipe (3), the helium self-excited oscillation heat pipe also communicating with the heat pipe storage tank; a refrigerator (9), which is fixed onto the vacuum container by means of an automatic insertion and removal assembly (10) of a heat conducting member; a first heat conducting member that is connected to the refrigerator is in close contact with a heat radiation screen assembly, and a second heat conducting member that is connected to the refrigerator is in close contact with the helium liquid storage tank. The system overcomes problems in existing superconducting magnet systems wherein cooling performance is low, a magnet rapidly loses temperature due to excessive heat leakage after a refrigerator has stopped working, and the maintenance complex reliability of the superconducting magnet system is poor.

Classes IPC  ?

• H01F 6/04 - Refroidissement

Abrégé

A multi-type energy storage multi-level control method, comprising: a fluctuation suppression strategy, an energy/power distribution strategy, and an economic operation strategy. The fluctuation suppression strategy is used to smoothen a microgrid original power curve, so as to obtain a microgrid grid-connected power curve and an energy storage total load curve; an energy storage charge-discharge distribution strategy based on a power-type energy storage charging state is used on the basis of a first-order filtering algorithm, to implement power distribution between energy-type energy storage and power-type energy storage; and an economic operation strategy based on full life cycle costs is used to implement power distribution inside the power-type energy storage (that is, power distribution between supercapacitor and flywheel energy storage), and an economic operation strategy based on per-kilowatt-hour electricity costs is used to implement power distribution inside the energy-type energy storage (that is, power distribution between a lithium battery and a flow battery).

Classes IPC  ?

• H02J 3/32 - Dispositions pour l'équilibrage de charge dans un réseau par emmagasinage d'énergie utilisant des batteries avec moyens de conversion

Abrégé

A gravity gradient measurement method and apparatus. In the gravity gradient measurement apparatus, a turntable (3) rotates horizontally around an earth-vertical axis, a vacuum layer (7) is disposed on the turntable (3), the vacuum layer (7) and the turntable (3) define a first chamber, a first three-axis accelerometer (1) and a second three-axis accelerometer (2) are located in the first chamber, the first three-axis accelerometer (1) and the second three-axis accelerometer (2) are symmetrical to each other on the x-axis with respect to the origin of coordinates, distances from the first three-axis accelerometer (1) and the second three-axis accelerometer (2) to the origin of coordinates are both R, the first three-axis accelerometer (1) and the second three-axis accelerometer (2) are symmetrical to each other on the z-axis with respect to the origin of coordinates, a distance, on the z-axis, between the first three-axis accelerometer (1) and the second three-axis accelerometer (2) is h; a measurement module determines, according to acceleration values measured by the first three-axis accelerometer (1) and the second three-axis accelerometer (2), a gravity gradient value in a coordinate system. The gravity gradient measurement method and apparatus of the invention measure a full-tensor gravity gradient by using two three-axis accelerometers.

Classes IPC  ?

• G01V 7/00 - Mesure de champs ou d'ondes de gravitationProspection ou détection gravimétrique

Abrégé

A strong-magnetic focused magnet system with a terahertz source includes a first superconducting main coil and a second superconducting main coil. The second superconducting main coil surrounds the outer surface of the first superconducting main coil, and the second superconducting main coil is coaxial with the first superconducting main coil.

Classes IPC  ?

• H01F 7/00 - Aimants
• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines
• H01F 6/04 - Refroidissement

Abrégé

Provided are a grapheme and a preparation method therefor, a supercapacitor electrode containing the grapheme, and a supercapacitor. The method comprises: i) placing a mixture of magnesium powder and solid oxide powder in an environment containing carbon dioxide; and ii) heating the mixture to enable the magnesium powder to react with the carbon dioxide, thereby obtaining grapheme. The specific surface area of the grapheme is 350-750 m2/g, and the pore volume is 1-2 cm3/g. The method is simple and easy to implement and has low costs and high yield; the product grapheme has few impurities, high carbon-oxygen ratio, and excellent capacitive performance and electrochemical stability.

Classes IPC  ?

• C01B 32/184 - Préparation
• C01B 32/182 - Graphène

Abrégé

Disclosed is a strong-magnetic-focused magnet system with a terahertz source, which relates to the field of terahertz. The system comprises a first main superconducting coil and a second main superconducting coil, the second main superconducting coil being located on an outer surface of the first main superconducting coil, and the second main superconducting coil being coaxial with the first main superconducting coil. The system can overcome the problems in the prior art that the intensity, stability and accuracy of a magnetic field are relatively low.

Classes IPC  ?

• H01F 6/00 - Aimants supraconducteursBobines supraconductrices
• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines

Abrégé

A superconducting magnet system for head imaging is disclosed which includes a cryocooler, a high-pressure helium container, a self-excitation heat pipe and a superconducting magnet. A second stage coldhead of the cryocooler is connected to the high-pressure helium container for converting the helium gas in the high-pressure helium container into liquid helium. The self-excitation heat pipe forms a closed cooling loop, and liquid helium in the high-pressure helium container flows circularly in the self-excitation heat pipe. The self-excitation heat pipe cools the superconducting magnet, wherein part of the liquid helium in the self-excitation heat pipe is converted into the helium gas due to the heat disturbance generated by the superconducting magnet, and the helium gas interacts with the liquid helium to generate liquid helium vibration.

Classes IPC  ?

• H01F 5/00 - Bobines d'induction
• H01F 6/04 - Refroidissement
• G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient
• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines

Abrégé

A direct-current fault isolation type subunit topology for a flexible direct-current power transmission converter station, comprising at least one capacitor group, at least two fully-controlled semiconductor devices, and a fault isolation combinational circuit. The at least two fully-controlled semiconductor devices are connected to the at least one capacitor group to form a half-bridge subunit form. A plurality of leading-out terminals of the fault isolation combinational circuit are connected to a positive electrode and a negative electrode of the at least one capacitor group, and connection points of the at least two fully-controlled semiconductor devices respectively.

Classes IPC  ?

• H02H 7/10 - Circuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour convertisseursCircuits de protection de sécurité spécialement adaptés aux machines ou aux appareils électriques de types particuliers ou pour la protection sectionnelle de systèmes de câble ou de ligne, et effectuant une commutation automatique dans le cas d'un changement indésirable des conditions normales de travail pour redresseurs

Abrégé

A low-temperature superconducting device for measuring gravity, includes a low-temperature container, a cryocooler, a rotor chamber, a superconducting rotor, an upper levitation coil, a lower levitation coil, an upper electrode, an intermediate electrode, a lower electrode, a magnetic shielding chamber and a superconducting quantum interference device. By cooling the whole low-temperature superconducting device using a cryocooler, the intermediate electrode disposed in the body of the magnetic shielding chamber will generate an output voltage when the superconducting rotor is displaced due to a change of gravity. Thus, the superconducting quantum interference device can make the superconducting rotor return to the central balance position by adjusting the operating current of the upper levitation coil or the lower levitation coil. A change of gravity can be determined based on the operating current fed back to the upper levitation coil or the lower levitation coil.

Classes IPC  ?

• G01V 7/00 - Mesure de champs ou d'ondes de gravitationProspection ou détection gravimétrique
• G01V 7/02 - Mesure de champs ou d'ondes de gravitationProspection ou détection gravimétrique Détails
• G01R 33/12 - Mesure de propriétés magnétiques des articles ou échantillons de solides ou de fluides

Abrégé

A direct-current circuit breaker consists of an initial current passage (23), a first combination loop (21), and a second combination loop (22). A first leading-out terminal of the initial current passage (23) is connected to a second leading-out terminal of the first combination loop (21). A second leading-out terminal of the initial current passage (23) is connected to a first leading-out terminal of the second combination loop (22). The first leading-out terminal of the first combination loop (21) serves as a first leading-out terminal of the direct-current circuit breaker and is connected to a direct-current power transmission line. The second leading-out terminal of the second combination loop (22) serves as a second leading-out terminal of the direct-current circuit breaker and is connected to the other end of the direct-current power transmission line. When a high-voltage direct-current power transmission circuit is failed, the failed power transmission circuit can be quickly switched off.

Classes IPC  ?

• H01H 9/54 - Circuits non adaptés à une application particulière du dispositif de commutation non prévus ailleurs
• H02H 3/087 - Circuits de protection de sécurité pour déconnexion automatique due directement à un changement indésirable des conditions électriques normales de travail avec ou sans reconnexion sensibles à une surcharge pour des systèmes à courant continu

Abrégé

Provided is a resonant current limiter based on an insulator-metal phase change resistor. The resistor (RPC) made of an insulator-metallic phase change material is in parallel connection with a capacitor (C), and then is in series connection with a reactor (L). While in normal operation, the phase change resistor (RPC) is in a high-resistance state, the current passing therethrough is low, the temperature rise is low, the current mainly flows through a circuit formed by the reactor (L) and the capacitor (C) in series connection, and the reactor (L) and the capacitor(C) form a serially connected resonant circuit which is in a low-impedance state and has small influence on a power grid system. When the power grid system breaks down and is short-circuited, the current flowing through the phase change resistor (RPC) is increased, the temperature is rapidly increased, and the insulator-metal phase change material undergoes phase change and enters a low-resistance state. The short-circuit current is transferred to the phase change resistor (RPC) branch from the capacitor (C) branch, the impedance of the power grid system is increased, and the short-circuit current is reduced. The insulator-metal phase change material is a negative-temperature coefficient insulator-metal phase change material of VO2, V2O3 and the like.

Classes IPC  ?

• H02H 9/02 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de courant

Abrégé

A fault current limiter based on a combined quick switching switch; the combined quick switching switch is firstly connected to a capacitor (C) in parallel, and then connected to a conventional reactor (L) in series; the combined quick switching switch consists of a tightly-coupled double-winding reactor having reverse dotted terminals, and a quick switching switch; the first winding (L1) of the tightly-coupled double-winding reactor is firstly connected to the quick switching switch in series, and then connected to a second winding (L2) in parallel; the quick switching switch consists of one or more of a mechanical switch (K), a thyristor (T), a controllable trigger gap (G), and a lightning arrester (MOV) mutually connected in parallel; when a short-circuit fault occurs, a quick switching switch having low tolerance for short-circuit current can be selected to realize the switching-off of the first winding (L1) of the tightly-coupled double-winding reactor; and when the first winding (L1) is conductive, the reactance generated by the first winding (L1) and the second winding (L2) of the tightly-coupled double-winding reactor are mutually counteracted, thus reducing the reactance.

Classes IPC  ?

• H02H 9/02 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de courant
• H02H 9/04 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de tension

Abrégé

The present invention provides a superconducting magnet system for head imaging. The superconducting magnet system includes a refrigerating machine, a high-pressure helium container, a self-excitation heat pipe and a superconducting magnet. A secondary cooling head of the refrigerating machine is connected with the high-pressure helium container, for transforming the helium gas in the high-pressure helium container into the liquid helium. The both ends of the self-excitation heat pipe are connected respectively with the high-pressure helium container to form a closed-loop cooling circuit, so that the liquid helium in the high-pressure helium container flows circularly in the self-excitation heat pipe. The self-excitation heat pipe is wound uniformly around the exterior surface of the superconducting magnet to cool the superconducting magnet. When a part of the liquid helium in the self-excitation heat pipe is transformed into the helium gas due to the heat disturbance of the superconducting magnet, the helium gas and the liquid helium act on each other to generate the liquid helium libration. Therefore the liquid helium consumption is reduced, and the heat radiation effect and the temperature uniformity are improved.

Classes IPC  ?

• H01F 6/00 - Aimants supraconducteursBobines supraconductrices
• H01F 6/04 - Refroidissement
• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines
• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations

Abrégé

An open type nuclear magnetic resonance magnet system having an iron ring member. A superconducting coil and a superconducting switch form a closed-loop current circuit to generate a magnetic field. The generated magnetic field gains a magnetic flux circuit and executes magnetic field shielding through upper and lower iron yokes and a lateral iron yoke. The magnet system generates a desired magnetic field in a magnet imaging central area via the superconducting coil. To balance the extremely high electromagnetic force between the superconducting coil and the upper and lower iron yokes, an annular iron ring is mounted in a space defined by an inner perimeter wall of in a cryogenic container. The magnetic field distribution between the superconducting coil and the upper and lower iron yokes is changed via the iron ring, so that the electromagnetic interaction force therebetween is reduced.

Classes IPC  ?

• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• G01R 33/3875 - Compensation des inhomogénéités utilisant des ensembles de bobines de correction, p. ex. compensation active
• G01R 33/421 - Blindage du champ magnétique principal ou du champ magnétique à gradient
• G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient
• G01R 33/34 - Détails de structure, p. ex. résonateurs

Abrégé

A self-shield open magnetic resonance imaging superconducting magnet comprises five pairs of coils: shim coils, first main magnetic coils, second main magnetic coils, third main magnetic coils, and shielding coils. The five pairs of coils are symmetric about the center. The shim coils are arranged closest to the center point; the first main magnetic coils, the second main magnetic coils, the third main magnetic coils, and the shielding coils are arranged in sequence outside. The first main magnetic coils are connected with reverse current. The second and third main magnetic coils are connected with positive current for providing the main magnetic field strength. The shim coils are connected with positive current for compensating the magnetic field in the central region. The shielding coils are connected with reverse current for creating a magnetic field opposite to the main magnetic field for compensating the stray magnetic field in the space.

Classes IPC  ?

• G01R 33/035 - Mesure de la direction ou de l'intensité de champs magnétiques ou de flux magnétiques en utilisant des dispositifs supraconducteurs
• G01R 33/34 - Détails de structure, p. ex. résonateurs
• G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient
• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines
• G01R 33/421 - Blindage du champ magnétique principal ou du champ magnétique à gradient

Abrégé

A low-temperature superconducting device for measuring gravity, comprising a low-temperature container (1), a refrigerating machine (2), a rotor chamber (4), a superconducting rotor (5), an upper levitation coil (6), a lower levitation coil (6'), an upper electrode (7), an intermediate electrode (8), a lower electrode (9), a magnetic shielding chamber (11) and a superconducting quantum interference device (14). The low-temperature superconducting device is refrigerated by the refrigerating machine (2). The intermediate electrode (8) arranged in the magnetic shielding chamber (11) generates a voltage when the superconducting rotor (5) experiences displacement because of a change in gravity, so that the superconducting quantum interference device (14) adjusts the operating current of the upper levitation coil (6) or the lower levitation coil (6'), thereby enabling the superconducting rotor (5) to return to the original central balance location. The change in gravity can be determined by the operating current fed back to the upper levitation coil (6) or the lower levitation coil (6'). The low-temperature superconducting device overcomes the defect that the existing superconducting device for measuring gravity cannot independently operate for a long time, and is suitable for use in various field environments.

Classes IPC  ?

• G01V 7/00 - Mesure de champs ou d'ondes de gravitationProspection ou détection gravimétrique
• G01V 7/06 - Analyse ou interprétation des enregistrements gravimétriques

Abrégé

A magnetic resonance imaging superconducting magnet system and a method and device for acquiring structural parameters thereof. The method includes: performing continuous grid division on a spatial range where a coil system is to be disposed, regarding each grid obtained by the division as a current circle, and uniformly dividing a DSV surface of a superconducting magnet system and an ellipsoidal surface of a 5 Gauss stray field into a plurality of target points; by means of a linear programming algorithm, calculating the current distribution at the site of each grid, which makes the volume of the coil system minimum, so as to obtain a current distribution pattern; and taking the number and spatial positions of non-zero current values in the current distribution pattern as the number and initial positions of solenoid coils in the coil system respectively, and by means of a nonlinear optimization algorithm, calculating the size and position parameter of each solenoid coil when the coil system volume is minimum, so as to acquire the final structural parameters of the coil system. The method and device can improve the acquisition efficiency of the structural parameters of an MRI superconducting magnet system, and make a coil structure in the MRI superconducting magnet system relatively small.

Classes IPC  ?

• G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient

Abrégé

A reactor-type short circuit fault current limiter, comprising a first reactor (L1), a second reactor (L2), a switch (K1), a capacitor (C1) and arresters (H1, H2 and H3). The first reactor (L1) consists of a first winding (L11) and a second winding (L12) by intercoupling through a magnetic circuit, one end of the first winding (L11) and one end of the second winding (L12) are connected in parallel to each other at a first connection point (a), and the other end of the first winding (L11) is connected in series to the switch (K1) and then connected in parallel to the other end of the second winding (L12) at a second connection point (b). When the power grid is in a steady state, a current limiter works in a series resonance or series compensation state, and presents a low impedance; when the power grid has a short circuit fault, the windings of a reactor undergo overcurrent saturation, and at the same time, the reactance change of the reactor is controlled by closing a switch, so as to produce a high impedance to achieve fault current limiting. The current limiter enhances the current limiting capacity, reduces the system manufacturing cost, has insignificant impact on the power grid, and improves the operational safety and reliability of the power grid.

Classes IPC  ?

• H02H 9/02 - Circuits de protection de sécurité pour limiter l'excès de courant ou de tension sans déconnexion sensibles à un excès de courant

Abrégé

A device and a method for inhibiting vibration of a superconducting magnetic suspension rotor. The device comprises a rotor cavity housing, lateral coils, a superconducting rotor with a rotor top plane, a copper plate, pole shoes, a z-axial vibration measuring sensor, an x-axial vibration measuring sensor, a y-axial vibration measuring sensor, and a copper ring, the pole shoes having a spherical inner surface and being arranged symmetrically up and down so as to form a rotor cavity; the annular lateral coils being closely adjacent to an outside cylindrical surface of the rotor cavity housing and fixed to the same; the z-axial vibration measuring sensor being fixed to a central region of the copper plate; the x-axial vibration measuring sensor being mounted along an x-coordinate axis and the y-axial vibration measuring sensor mounted on a on the copper ring which is mounted along an equatorial plane of the rotor.

Classes IPC  ?

• H02N 15/00 - Dispositifs de maintien ou de lévitation utilisant l'attraction ou la répulsion magnétique, non prévus ailleurs
• H02P 9/00 - Dispositions pour la commande de génératrices électriques de façon à obtenir les caractéristiques désirées à la sortie

Abrégé

A high temperature super-conducting cable multi-segment connection device: two high temperature super-conducting cable powered conductors are connected to a powered conductor crimp terminal (20) via a transitional copper metal end head and a powered conductor compensation flexible wire (19); a low temperature Dewar tube vacuum inserting male plug (5) is inserted into a low temperature Dewar tube vacuum inserting female socket (7); a semi-conduction shielding layer (16) in the high temperature super-conducting cable multi-segment connection device is connected to a semi-conduction shielding layer (10) in a high temperature super-conducting cable body; the insulation layer (14) of the high temperature super-conducting cable multi-segment connection device is connected to the insulation layer (11) of the high temperature super-conducting cable body; a semi-conduction shielding layer (15) outside the high temperature super-conducting cable multi-segment connection device is connected to a semi-conduction shielding layer (13) outside the high temperature super-conducting cable body; the metallic shielding layer (21) of the high temperature super-conducting cable multi-segment connection device is connected to the metallic shielding layer (25) of the high temperature super-conducting cable body; and the protective layer (17) of the high temperature super-conducting cable multi-segment connection device is connected to a protective layer (12) of the high temperature super-conducting cable body. The high temperature super-conducting cable multi-segment connection device solves the technical problems such as long distance power transmission multi-segment super-conducting cable intermediate connection, high temperature super-conducting cable powered conductor connection, low temperature Dewar tube connection, insulation system connection and the like.

Classes IPC  ?

• H02G 15/18 - Jonctions de câbles protégées par des manchons, p. ex. pour câble de télécommunication
• H01R 4/68 - Connexions à ou entre conducteurs supraconducteurs

Abrégé

A free liquid helium volatilization superconductive magnetic suspension device includes a low temperature container (1), a refrigeration (2), a cold screen (3), a liquid helium container (4), a superconductive rotor (5), a suspension coil (6), a rotor vacuum (7), a liquid tube(8), a condensator (12) and a pole-axis displacement sensor (13). The heat generated by the wires of the suspension coil (6) can be prevented transferring to the liquid helium container (4) by the room temperature lead joint (9), the high temperature superconducting lead joint (10) and low temperature superconducting lead joint (11). Therefore the volatilization of the liquid helium in the liquid helium container (4) can be reduced. The status of free liquid helium volatilization in the liquid helium container (4) can be reached through refrigeration (2) cooling condensator (12) to liquefy the helium. The device needs not to be input the liquid helium time after time and can run independently for a long term.

Classes IPC  ?

• H02N 15/00 - Dispositifs de maintien ou de lévitation utilisant l'attraction ou la répulsion magnétique, non prévus ailleurs

Abrégé

A superconducting magnet system for nuclear magnetic resonance with a high magnetic field and a high degree of homogeneity of magnetic field is provided. The system comprises a main coil and a magnetic field homogeneity compensating coil having a combination of a forward current and a reverse current, and is composed of 24 superconducting coils formed by winding NbTi/Cu low-temperature superconducting wires. The system can produce a magnetic field of 9.4 T within a room-temperature space of 800 mm and can obtain a degree of non-homogeneity of magnetic field less than 0.1 ppm within a spherical volume of 300 mm. The system is equipped with a superconducting magnet inside, and a low-temperature vessel for liquid helium provides a low-temperature environment of 4K which is required for the normal operation of the superconducting magnet. A ferro-magnetic shielding system enables the system to have a good electromagnetic compatibility.

Classes IPC  ?

• G01R 33/035 - Mesure de la direction ou de l'intensité de champs magnétiques ou de flux magnétiques en utilisant des dispositifs supraconducteurs
• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient
• G01R 33/3875 - Compensation des inhomogénéités utilisant des ensembles de bobines de correction, p. ex. compensation active
• G01R 33/421 - Blindage du champ magnétique principal ou du champ magnétique à gradient

Abrégé

A superconducting magnetic levitation based north-seeking device and north-seeking method thereof include a low temperature container (5), a refrigerator (6), a direction reference line (7), a heat transfer screen (8), a rotor cavity (9), a superconducting rotor (10), a radiation shield (11), an equatorial signal read-out figure (12), levitation coils (13), a driving coil (14), a polar-axis sensor (15), an equatorial sensor 1 (16) and an equatorial sensor 2(17). The equatorial signal read-out figure (12) on the surface of the superconducting rotor (10) is detected by the equatorial sensors, and then through calculation, the angular velocity components ωι and ω2 of the horizontal component of the rotational angular velocity of the earth on the optical-axes of the two equatorial sensors can be obtained. By means of the formula α=arctan（ωι/ω2）, the angle α between the equatorial sensor 1 (16) and the true north direction can be calculated. The external interference of the rotor is reduced because of the superconducting magnetic levitation technique, and the interference moment of the rotor is small because the material creep is small at low temperature, so a high-precision orientation is achieved. Furthermore, the north-seeking device has the advantage of short north-seeking time because of the short startup time and fast stabilization.

Classes IPC  ?

• G01C 19/38 - Gyroscopes rotatifs pour indiquer une direction dans le plan horizontal, p. ex. compas gyroscopiques avec action de recherche du nord par des moyens autres que magnétiques, p. ex. gyrocompas utilisant la rotation de la terre

Abrégé

A method for improving an upper critical field and a critical current density of an iron-based superconductor is characterized by adding tin, a tin-containing compound or a tin-containing alloy into precursor powder or raw material powder of an iron-based superconductor bulk or strip, mixing the mixture evenly, then pressing the precursor powder into a bulk or filling the precursor powder into a metal pipe, composite metal pipe or alloy pipe and performing drawing and rolling to form a wire or strip, and then roasting the bulk, the wire or the strip at the temperature of between 200℃ and 1300℃ for 1 second to 100 hours under a protective atmosphere or vacuum condition. The iron-based superconductor prepared in the present invention has excellent superconducting characteristics, comprising a high critical current characteristic, a high upper critical field and an irreversible field.

Classes IPC  ?

• H01B 13/00 - Appareils ou procédés spécialement adaptés à la fabrication de conducteurs ou câbles
• H01B 12/00 - Conducteurs, câbles ou lignes de transmission supraconducteurs ou hyperconducteurs

Abrégé

A high magnetic field superconducting magnet system with large crossing warm bore is disclosed, a superconducting coil thereof includes a low temperature superconducting coil and a high temperature superconducting coil. The superconducting coils are connected to a thermal shield and a flange of a low temperature container by a supporting drawbar, thus the superconducting coils as a whole are supported inside the low temperature container. A thermal switch is connected to a primary cold head and a secondary cold head of the cryocooler. The secondary cold head of the cryocooler is connected to a magnet-reinforced supporting flange at the two ends of the low temperature superconducting coil and the high temperature superconducting coil by a cold conduction strip. The superconducting magnet system has a room temperature bore in horizontal direction and a room temperature bore in vertical direction. A thermal shield outside the room temperature bore in horizontal direction is used for preventing thermal radiation by the room temperature bore in horizontal direction to the superconducting coils. A separation supporting frame separates the low temperature superconducting coil and the high temperature superconducting coil into two parts, such that a two-dimensional room temperature space can be included inside the superconducting magnet when the superconducting magnet system is formed as a whole.

Classes IPC  ?

• H01F 6/00 - Aimants supraconducteursBobines supraconductrices

Abrégé

A process for fabricating an ultra-low-resistance superconducting joint that has high shielding characteristics. The process includes: corroding copper on the outer surface at the end of a NbTi/Cu superconducting wire to form terminal NbTi superconducting filaments; inserting same number of NbTi superconducting filaments into each through hole of the niobium layer of a Nb/NbTi/Cu multilayer composite rod; pressing at the outside of the Nb/NbTi/Cu multilayer composite rod to combine the Nb/NbTi/Cu multilayer composite rod and NbTi superconducting filaments together to form a joint; and inserting the joint into a YBCO tube, and then filling the YBCO tube with molten bismuth-lead-tin-cadmium (BiPbSnCd) alloy solder to form a superconducting joint with high shielding and low resistance characteristics.

Classes IPC  ?

• H01B 12/10 - Conducteurs, câbles ou lignes de transmission supraconducteurs ou hyperconducteurs caractérisés par leurs formes à plusieurs filaments enrobés dans des conducteurs normaux

Abrégé

An open nuclear magnetic resonance magnet system having an iron ring structure. A superconducting coil (1) and a superconducting switch (14) form a closed current loop to generate a magnetic field, and the generated magnetic field obtains a magnetic flux loop and executes magnetic field shielding via upper and lower iron yokes (3) and lateral iron yokes (13). The magnet system generates the required magnetic field in a magnet imaging central area (15) via the superconducting coil (1). In order to balance the great electromagnetic force between the superconducting coil (1) and the upper and lower iron yokes (3), an annular iron ring (4) is installed in the inner aperture of a low temperature container (2). The magnetic field distribution between the superconducting coil (1) and the upper and lower iron yokes (3) is changed via the iron ring (4), thereby reducing the interactive electromagnetic force therebetween.

Classes IPC  ?

• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• H01F 6/00 - Aimants supraconducteursBobines supraconductrices

Abrégé

A self-shield open magnetic resonance imaging superconducting magnet comprises five pairs of coils, i.e. shim coils (1), the first main magnetic coils (2), the second main magnetic field coils (3), the third main magnetic field coils (4), and shielding coils (5), and the five pairs of coils are symmetric about the center. The shim coils (1) are arranged closest to the center point, and the first main magnetic field coils (2), the second main magnetic field coils (3), the third main magnetic field coils (4), and the shielding coils (5) are arranged in sequence outside. The first main magnetic field coils (2) are connected with reverse current, and the second main magnetic field coils (3) and the third main magnetic field coils (4) are connected with positive current for providing the main magnetic field strength. The shim coils (1) are connected with positive current for compensating the magnetic field in the central region to improve the uniformity of the magnetic field in the ball region of the magnet. The shielding coils (5) are connected with reverse current for creating a magnetic field opposite to the main magnetic field for compensating the stray magnetic field in the space. The superconducting magnet provides 1 to 1.5T of center magnetic field in a range of 360 mm, and 5 Gauss of stray field is limited to a range of 5 meter.

Classes IPC  ?

• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines
• G01R 33/38 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient

Abrégé

An open-type conduction cooling nuclear magnetic resonance superconducting magnet system. Inner support rods (9) are disposed between an upper and a lower superconducting coil (6, 11). Magnetic heat exchangers (8) are respectively welded on an upper and a lower coil frame (7, 12). The upper and lower superconducting coils (6, 11) respectively adopt a high-pressure helium gas vessel (4) as an outer support and stress support frame. The high-pressure helium gas vessels (4) and the upper and lower superconducting coils (6, 11) are installed in a low-temperature vacuum vessel (2), and the upper and lower superconducting coils (6, 11) are longitudinally and symmetrically arranged in the high-pressure helium gas vessels (4). An upper coil stress support structure (13) supports the upper superconducting coil (6), and a lower coil stress support structure (17) supports the lower superconducting coil (11). The upper and lower coil stress support structures are annularly arranged on an outer wall of the low-temperature vessel. A support beam of a C-shaped structure supports the whole weight of the system.

Classes IPC  ?

• H01F 6/04 - Refroidissement

Abrégé

An array valve comprises several valve groups and a control module. Each valve group is used to control a corresponding control point; each valve group comprises more than N electrorheological fluid single valves (301, 302, 303, 304) connected in series, where N is not smaller than 2. The control module comprises several control lines (311, 312, 313, 314) and one switching tube for controlling each control line (311, 312, 313, 314). N control lines (311, 312, 313, 314) pass through each valve group, respectively. Each electrorheological fluid single valve (301, 302, 303, 304) in each valve group corresponds to one of the control lines (311, 312, 313, 314). The control module is used to control on and off of a corresponding valve group through the switching tube via the control line. The mode of connecting electrorheological fluid single valves in series is switched to a control mode where each control line requires one switching tube. The array valve, on the basis of greatly reducing the number of switching tubes, implements independent control of each valve, so that system cost is reduced on one aspect and heat of switching tubes is greatly reduced on the other aspect.

Classes IPC  ?

• F16K 13/10 - Agencements pour obturer au moyen d'une substance liquide ou granulaire
• G09B 21/00 - Moyens d'enseignement ou de communication destinés aux aveugles, sourds ou muets

Abrégé

3Sn/Cu superconducting wire. The superconducting magnet can operate off-line through solid nitrogen formed by a cryocooler and high-pressure nitrogen. The superconducting magnet and the superconducting switch constitute a closed loop, thereby achieving magnetic field stability, without outside electromagnetic interference. The superconducting magnet system can provide a magnetic field having special spatial distribution and high stability.

Classes IPC  ?

• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines

Abrégé

A nuclear magnetic resonance superconducting magnet system with high uniformity of magnetic field is provided. The system comprises a main coil (1) and a compensating coil (19) for uniformity of magnetic field with the combination of forward current and reverse current and is composed of 24 superconducting coils wound with NbTi/Cu low-temperature superconducting wire. The system can produce a magnetic field of 9.4T within a room-temperature space of 800mm and can obtain a nonuniformity of magnetic field which is less than 0.1ppm within the scope of 300mm. The system is equipped with a superconducting magnet inside and a low-temperature vessel (2) of liquid helium (4) provides a low-temperature environment of 4k which is required for the normal operation of the superconducting magnet. An ferromagnetic shielding system enables the system to have good electromagnetic compatibility. The system is compact in structure and its running cost is low.

Classes IPC  ?

• H01F 6/00 - Aimants supraconducteursBobines supraconductrices
• G01R 33/3815 - Systèmes pour produire, homogénéiser ou stabiliser le champ magnétique directeur ou le champ magnétique à gradient utilisant des électro-aimants avec des bobines supraconductrices, p. ex. leurs alimentations
• G01R 33/3875 - Compensation des inhomogénéités utilisant des ensembles de bobines de correction, p. ex. compensation active

Abrégé

A device and method for measuring a quenching propagation speed of a superconducting coil is provided. The device has a Dewar type container (1) provided with a background superconducting magnetic body (4), and a refrigerator (2) is arranged in the center of an upper end face of the Dewar type container (1); a low-temperature container (8) is connected to a lower end of a secondary cooling head of the refrigerator (2); a superconducting coil under test (5) is arranged in the low-temperature container (8); an upper cover plate of the low-temperature container (8) is connected to a current lead (13) and a measurement lead (14) of the superconducting coil under test. Accurate measurement of the quenching propagation speed of the superconducting coil in two dimensions can be realized via the device.

Classes IPC  ?

• G01R 31/00 - Dispositions pour tester les propriétés électriquesDispositions pour la localisation des pannes électriquesDispositions pour tests électriques caractérisées par ce qui est testé, non prévues ailleurs

Abrégé

A single-phase five-level power converter comprises a three-phase bridge and two coupled inductors. The output terminal (1) of one of the bridge arms of the three-phase bridge is configured as one output terminal (a) of the converter. The output terminals (2, 3) of the other two bridge arms of the three-phase bridge are connected with the two non-common connection nodes of the two coupled inductors, respectively. The common connection node of the two coupled inductors is configured as the other output terminal (b) of the converter. The two coupled inductors are connected in series. The converter can be used in single-phase inverters or rectifiers. Three such converters can be connected to form a three-phase five-level power converter. Multiple such converters can be connected in cascade to form a power converter with more levels.

Classes IPC  ?

• H02M 7/48 - Transformation d'une puissance d'entrée en courant continu en une puissance de sortie en courant alternatif sans possibilité de réversibilité par convertisseurs statiques utilisant des tubes à décharge avec électrode de commande ou des dispositifs à semi-conducteurs avec électrode de commande

Abrégé

A device and a method for inhibiting vibration of a superconducting magnetic suspension rotor. The device comprises a rotor cavity housing (l), lateral coils (2, 13), a rotor-top plane (3), a superconducting rotor (4), a copper plate (5), pole shoes (6), a z-axial vibration measuring sensor (7), an x-axial vibration measuring sensor (8), a y-axial vibration measuring sensor (9) and a copper ring (11). The pole shoe (6) has a spherical inner surface. The two pole shoes are arranged symmetrically up and down to form a rotor cavity (10). The two annular lateral coils are closely attached to and fixed on an outer cylindrical surface of the rotor cavity housing. The z-axial vibration measuring sensor is connected to and fixed at the center of the copper plate. The x-axial vibration measuring sensor is mounted along the x-coordinate axis, and the y-axial vibration measuring sensor is mounted along the y-coordinate axis on the copper ring in the equatorial plane. The method for inhibiting vibration of a superconducting magnetic suspension rotor comprises: obtaining a rotation speed-amplitude curve of the rotor in the device for inhibiting vibration of a superconducting magnetic suspension rotor under multiple support rigidities; and obtaining, according to the rotation speed-amplitude curve, a low amplitude by selecting a predetermined support rigidity under a predetermined rotation speed, the multiple support rigidities being realized by allowing different currents to pass through the upper lateral coil and the lower lateral coil. The device for inhibiting vibration of a superconducting magnetic suspension rotor has low power consumption, and the method is simple but effective.

Classes IPC  ?

• H02N 15/00 - Dispositifs de maintien ou de lévitation utilisant l'attraction ou la répulsion magnétique, non prévus ailleurs

Abrégé

A device and method for measuring ambipolar magnetic torque of a space magnet and a method for compensating ambipolar magnetic torque of a space magnet are provided. The device comprises a space magnet (1), a support bar (2), a rotatable rack (3), a steeve (4), Helmholtz coils (5), a bearing seat (6), a dynamometer (7) and a fixation mount (8). Rotary torque is generated by the interaction between the magnetic field generated by the Helmholtz coils (5) and the torque of the space magnet (1). The Helmholtz coils (5) subject to the action of the rotary torque, and are rotated by rotatable rack (3) and the steeve (4) on the support bar (2) loaded on the bearing seat (6). The ambipolar magnetic torque of the magnet is measured by measuring the rotary torque of the Helmholtz coils (5).

Classes IPC  ?

• G01R 33/12 - Mesure de propriétés magnétiques des articles ou échantillons de solides ou de fluides
• G01L 3/02 - Dynamomètres de transmission rotatifs
• H04N 9/29 - Reproducteurs d'images utilisant des tubes à rayons cathodiques utilisant la démagnétisation ou la compensation des champs magnétiques externes

Abrégé

A superconducting magnet system for a high-power microwave source focus and electron cyclotron device includes a chiller (11), a vacuum chamber (12), a supporting rod (13), a heat radiation shield (16), a low-temperature system and a superconducting magnet (15). The superconducting magnet (15) includes an inner superconducting main coil (1), an outer superconducting main coil (2), two end compensating coils (3), a regulating coil (4) and a central regulating coil (5). Said coils are wound by Nb3Sn/Cu superconducting wire. The solid nitrogen formed by the chiller (11) and high-pressure nitrogen enables the superconducting magnet (15) to operate off line. The closed loop formed by the superconducting magnet (15) and a superconducting switch (18) makes a magnet field stable and not disturbed by outer electromagnetism. The superconducting magnet system can provide high-stable magnet field with special space distribution.

Classes IPC  ?

• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines
• H01F 6/04 - Refroidissement
• H03K 17/92 - Commutation ou ouverture de porte électronique, c.-à-d. par d'autres moyens que la fermeture et l'ouverture de contacts caractérisée par l'utilisation de composants spécifiés par l'utilisation, comme éléments actifs, de dispositifs supraconducteurs
• H05H 13/10 - Accélérateurs comprenant une ou plusieurs sections d'accélération linéaire et des aimants de courbure ou des dispositifs analogues pour faire revenir les particules chargées sur une trajectoire parallèle à la première section d'accélération, p. ex. microtrons

Abrégé

A method for fabricating a low resistance superconducting joint with a high shielding characteristic. The method includes: forming NbTi superconducting filaments (3) after corroding the copper (2) on the outer surfaces of the terminals of NbTi/Cu superconducting wires (1); inserting respectively the equal number of NbTi superconducting filaments (3) into each through-hole(8) which is in the niobium layer (5) of a Nb/NbTi/Cu multilayer composite rod (4); applying certain pressure outside the Nb/NbTi/Cu multilayer composite rod (4) and combining the Nb/NbTi/Cu multilayer composite rod (4) with the NbTi superconducting filaments (3) to form a joint by pressure; inserting the joint into a yttrium barium copper oxide(YBCO) pipe (9), then filling the YBCO pipe (9) with molten Wood's alloy solder (10),finally forming the high shielding and low resistance superconducting joint.

Classes IPC  ?

• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines
• H01B 12/00 - Conducteurs, câbles ou lignes de transmission supraconducteurs ou hyperconducteurs
• H01L 39/24 - Procédés ou appareils spécialement adaptés à la fabrication ou au traitement des dispositifs couverts par  ou de leurs parties constitutives

Abrégé

A superconductive magnet structure that can generate a rotating magnetic field is provided. A Helmholtz coil pair (3) in the z-axis direction supplies a magnetic field changing in z-axis direction, a Helmholtz coil pair (5) in the x-axis direction supplies a magnetic field changing in x-axis direction, and a Helmholtz coil pair (6) in the y-axis direction supplies a magnetic field changing in y-axis direction. A current amplitude and a current direction of the coils in the directions of x, y and z are controlled by a computer so that the required rotating magnetic field is obtained in the center of the superconductive magnet. A superconductive main coil (4) in the z-axis direction also can be provided that supplies a background magnetic field. The superconductive magnet is used in occasions for studying physical characteristics, including materials and magnetic-optic effect under the combined action of multi-physical fields under extreme conditions. The structure of superconductive magnet is simple, the running cost is low and the usage is convenient.

Classes IPC  ?

• H01F 6/00 - Aimants supraconducteursBobines supraconductrices

Abrégé

An evaporative cooling wind-energy pumped-storage combined generating system includes a wind power generating equipment (1) and a water pump (2), wherein the output end of the wind-power generating equipment (1) is connected with the input end of the water pump (2) by a connection mechanism (10). The water inlet and outlet of the water pump (2) are communicated with a lower water reservoir (3) and an upper water reservoir (4) through a water pumping pipe (11) and a water outlet pipe (12) respectively. The water inlet and outlet of a pumped-storage set (5) are communicated with the upper water reservoir (4) and the lower water reservoir (3) through a generation water diversion pipe (14) and a water drain pipe (13) respectively. The wind-power generating equipment (1) and the pumped-storage set (5) are both cooled in a stator evaporation cooling manner.

Classes IPC  ?

• F03D 9/00 - Adaptations des mécanismes moteurs à vent pour une utilisation particulièreCombinaisons des mécanismes moteurs à vent avec les appareils qu’ils entrainentMécanismes moteurs à vent spécialement adaptés à l’installation dans des endroits particuliers
• F03B 13/06 - Centrales ou ensembles machine-appareil du type à accumulation d'eau

Abrégé

A high-magnetic-field superconductive magnetic body system having a large separation gap is provided. A superconductive coil in the system includes a low-temperature superconductive coil (16) and a high-temperature superconductive coil (17). The superconductive coil is connected to a cold screen (3) and a low-temperature container flange (2) through a support drawing rod (8) so that the superconductive coils are supported in the low-temperature container integrally. A heat switch (7) is connected to a first level cold head and a second level cold head of a refrigerator (1). The second level cold head of the refrigerator (1) is connected to a strengthening support flange (10) for a magnetic body through a cold conductor band (5). The flange (10) is located at the two ends of the low-temperature superconductive coil (16) and the high-temperature superconductive coil (17). The superconductive magnetic body system has a horizontal-direction room temperature hole (12) and a vertical-direction room temperature hole (15). An outer cold screen (11) of the horizontal-direction room temperature hole (12) is used to stop the heat radiation from the horizontal-direction room temperature hole (12) to the superconductive coil. A separation support frame (9) divides the low-temperature superconductive coil (16) and the high-temperature superconductive coil (17) into two parts so that two-dimensional room temperature space is contained in a superconductive magnetic body when the superconductive magnetic body is formed integrally.

Classes IPC  ?

• H01F 6/00 - Aimants supraconducteursBobines supraconductrices

Abrégé

An electrode core for a high-voltage battery consists of more than two composite electrode plates (1) laminated. Every two composite electrode plates (1) have more than one micropore separator (2) without electron conductibility therebetween. The space between the composite electrode plates (1) is filled with a liquid or colloidal electrolyte (3). The edge of each composite electrode plate is fixed and insulated with an insulating adhesive (4). Two adjacent composite electrode plates (1) constitute a cell unit. The liquid or colloidal electrolyte (3) can not flow among the cell units. A surface positive electrode (5) and a surface negative electrode (6) of the electrode core are connected to a positive electrode current collector (7) with a positive electrode tab (8) and a negative electrode current collector (9) with a negative electrode tab (10) respectively.

Classes IPC  ?

• H01M 10/058 - Structure ou fabrication
• H01M 4/13 - Électrodes pour accumulateurs à électrolyte non aqueux, p. ex. pour accumulateurs au lithiumLeurs procédés de fabrication
• H01M 4/64 - Supports ou collecteurs
• H01M 10/0525 - Batteries du type "rocking chair" ou "fauteuil à bascule", p. ex. batteries à insertion ou intercalation de lithium dans les deux électrodesBatteries à l'ion lithium

Abrégé

A surface mount type evaporating cooling device of a super computer is disclosed. A condenser (15) is set on the top of the cabinet of the super computer; and an accumulating liquid main pipe (11) is positioned at the bottom of the evaporating cooling device. N cooling liquid boxes (9) are settled between the accumulating liquid main pipe (11) and an accumulating steam main pipe (12). A steam outlet pipe (13) is set on the top of the accumulating steam main pipe (12) and the bottom of the condenser (15). The accumulating steam main pipe (12) is connected with the condenser (15) through the steam outlet pipe (13), and the condenser (15) is connected with the accumulating liquid main pipe (11) through a liquid return pipe (14). The cooling liquid boxes (9) are closely contacted with the heating elements of the super computer, N liquid ingress pipes (7) contained on the N cooling liquid boxes are all connected with the accumulating liquid main pipe (11), and N steam delivery pipes (8) contained on the N cooling liquid boxes (9) are all connected with the accumulating steam main pipe (12), so as to form a sealed circulation cooling circuit. A plurality of liquid troughs, whose inner cavities are connected with each other, are set in the cooling liquid boxes (9), and the N cooling liquid boxes (9) are parallel on a liquid path.

Classes IPC  ?

• G06F 1/20 - Moyens de refroidissement

Abrégé

A superconducting switch with temperature closed-loop control comprises a superconducting switch body (8), a power supply circuit (15) and a control circuit (16). The superconducting switch body is arranged on a superconducting magnet (14) placed in a low temperature system, and the power supply circuit and the control circuit are positioned outside the low temperature system. The superconducting switch body consists of a superconducting switch framework (1), a superconducting coil (6) tightly wound on the superconducting switch framework, a heating wire coil (7), and a temperature probe (4) embedded on the superconducting switch framework. The power supply circuit consists of a power supply (10) and a contactor (9) which are connected in series and the power supply circuit is connected with the input end and the output end of the heating wire coil. The measure lead wire of the temperature probe is connected with the input end of the control circuit and the output end of the control circuit is connected with the control coil of the contactor. The control circuit performs temperature closed-loop control for the on and off of the contactor according to the actual temperature value of the superconducting switch body measured by the temperature probe.

Classes IPC  ?

• H03K 17/082 - Modifications pour protéger le circuit de commutation contre la surintensité ou la surtension par réaction du circuit de sortie vers le circuit de commande
• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines

Abrégé

A superconducting magnet system for generating high homogeneity and high magnetic field consists of a main coil, an outer coil, a quench protection circuit, a quench heater and a power supply. The main coil is composed of many concentric solenoid coils which are arranged from inside to outside. The outer coil out of the main coil includes a first back roll coil, a second back roll coil, a first superconducting coil for compensating sixth harmonic component, a second superconducting coil for compensating sixth harmonic component, a shielding ring and a shielding coil from inside to outside. Every loop circuit of the quench protection circuit is composed of a corresponding protection resistor, a diode and coil which is connected in series each other, and each coil has a corresponding quench protection heater. The classification linear diameter difference of the superconducting coils which contact each other in main coil is less than 0.05 mm. The homogeneity of the magnetic field in the 50 mm diameter working space is 0.15 ppm, because the high order harmonic component of the field is compensated by back roll method.

Classes IPC  ?

• H01B 12/00 - Conducteurs, câbles ou lignes de transmission supraconducteurs ou hyperconducteurs
• H01F 6/00 - Aimants supraconducteursBobines supraconductrices
• H01L 39/00 - Dispositifs utilisant la supraconductivité ou l'hyperconductivité; Procédés ou appareils spécialement adaptés à la fabrication ou au traitement de ces dispositifs ou de leurs parties constitutives
• H01L 39/24 - Procédés ou appareils spécialement adaptés à la fabrication ou au traitement des dispositifs couverts par  ou de leurs parties constitutives

Abrégé

A braille printing device is disclosed. The device comprises a paper picking-up mechanism, a paper feeding mechanism, a printing mechanism, a curing light source (8) and a paper discharging mechanism. The paper picking-up mechanism, the printing mechanism, the curing light source and the paper discharging mechanism are arranged above a base (6) in turn. The paper feeding mechanism is installed in an X-direction guide on the base (6) and moves to and fro along the X-direction guide under the paper picking-up mechanism, the printing mechanism, the curing light source (8) and the paper discharging mechanism. The printing mechanism is fixed to two posts (16) at two sides of the middle of the base (6). The curing light source (8) and a glue jet valve (10) of the printing mechanism are disposed at two sides of the posts (16) respectively. Electromagnetic clamps (7) of the paper discharging mechanism are mounted at the end of the base (6). The device can simultaneously perform printing and curing operations.

Classes IPC  ?

• B41J 3/32 - Machines à écrire ou mécanismes d'impression ou de marquage sélectif caractérisés par le but dans lequel ils sont construits pour l'impression en Braille ou avec des claviers spécialement adaptés aux aveugles ou aux handicapés
• B41M 3/16 - Impression en Braille
• B41J 13/10 - Supports de feuilles, taquets d'arrêt ou guides fixes

Abrégé

A glue-dipping type Braille printing device comprises a computer control system and a printing subsystem. The printing subsystem comprises a body (3,4,12), a multi-dimensional moving mechanism(14,15,19) capable of moving in at least two directions, a glue liquor supplying unit(5,17,18), a glue-dipping unit (6,7,8,11), and a curing unit (13). The body comprises a pedestal (3), a bracket (4), and a rotatable platform (12). The glue liquor supplying unit including a glue cartridge (5) is provided on the pedestal (3). The multi-dimensional moving mechanism is secured on the bracket. The glue-dipping unit including a glue-dipping needle (11) is held on the multi-dimensional moving mechanism. The glue-dipping needle (11) can contact with the glue liquor in the glue cartridge (5) till a head portion of the needle is adhered and suspended a little glue liquor, and can contact with a material to be printed (9) so that the glue liquor can be left on the material to be printed (9). The curing unit (13) is placed on the body so as to cure the glue liquor on the material to be printed to form a Braille point. It can be formed a Braille point on an ordinary carrier by the invention, and this kind of Braille point is firm and durable.

Classes IPC  ?

• B41J 3/32 - Machines à écrire ou mécanismes d'impression ou de marquage sélectif caractérisés par le but dans lequel ils sont construits pour l'impression en Braille ou avec des claviers spécialement adaptés aux aveugles ou aux handicapés

Abrégé

A superconducting magnet system for producing high uniformity and high magnetic field consists of a main coil, an outer coil, a quench protection circuit, a quench heater and a power supply. The main coil is composed of many concentric solenoid coils which are arranged from inside to outside. The outer coil out of the main coil includes a first back roll coil (13), a second back roll coil (14), a first superconducting coil (15) for compensating sixth harmonic component, a second superconducting coil (16) for compensating sixth harmonic component, a shielding ring (17) and a shielding coil (18) from inside to outside. Every loop circuit of the quench protection circuit is composed of a corresponding protection resistor, a diode and each coil which are connected in series each other, and each coil has a corresponding quench protection heater. The classification linear diameter difference of the superconducting coils which contact each other in main coil is less than 0.05mm. The uniformity of the magnetic field in the 50 mm diameter working space is 0.15ppm, because the high order harmonic component of the field is compensated by back roll method.

Classes IPC  ?

• H01F 6/06 - Bobines, p. ex. dispositions pour l'enroulement, l'isolation, les enveloppes ou les bornes des bobines

Abrégé

Superconductive wire and strip materials are provided, whose cores are superconductive iron-based compound. Outside of the cores are covered with a metallic tube, a compound metallic tube or an alloy tube. Materials of the canning tube are chosen from iron, copper, low carbon steel, non-corrosive steel, chrome, vanadium, manganese, titanium, zirconium, molybdenum, nickel, niobium, wolfram, celtium or tantalum. Preparing method of the superconductive wire or strip material is as follows: well mixing and milling the raw material exactly prepared according to chemical formula LnO1-xFxMPn or LnOMPn (wherein Ln is one or more elements selected from the group of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y;M is one or more elements selected from the group of Fe, Co, Ni and Ru;Pn is As, P or Sb;x=0-0.50); feeding the raw material into the metallic tube; filling the raw material compactly; sealing two ends of the tube; spin-forging, drawing, and rolling the metallic tube (rolling is only for the preparation of strip material); vacuum-annealing or annealing the obtained wire or strip material in inert atmosphere.

Classes IPC  ?

• H01B 12/00 - Conducteurs, câbles ou lignes de transmission supraconducteurs ou hyperconducteurs
• H01B 13/00 - Appareils ou procédés spécialement adaptés à la fabrication de conducteurs ou câbles

Abrégé

The braille convex spots of a braille product are colloid formed of solidify glue solidified on the printed carrier. A braille printing method uses computer to make the printing plate flexibly, and uses a glue-dropping unit to print said braille directly onto a printed carrier. A braille printing system using said printing method is also disclosed.

Classes IPC  ?

• G09B 21/00 - Moyens d'enseignement ou de communication destinés aux aveugles, sourds ou muets
• B41M 3/16 - Impression en Braille

Abrégé

A MgB2 superconducting wire or strip containing C and the manufacture method for it, in which the said superconducting material is substantially consisted of Mg, B and C. Its chemical formula is MgB2-xCx , where x is a value between 1 and 2, y is a value between 0 and 1, and the sum of x and y is greater than 1.5. The MgB2 superconducting wire or strip in the present application has a high irreversible field and the property of critical current density is very excellent, and it has good repeatability.

Classes IPC  ?

• H01B 12/04 - Conducteurs, câbles ou lignes de transmission supraconducteurs ou hyperconducteurs caractérisés par leurs formes à fil unique