Abstract

Propellor system with variable blade-angle mechanism for a propellor, wherein the propellor system comprising an induction machine and a mechanism for changing a blade-angle of a blade of the propellor, wherein the induction machine comprises: A stator (1) with stator circuit (2) conducting a machine current; a first rotor (3) arranged to rotate around a machine axis (6) with respect to the stator (1), wherein the first rotor (3) comprising a first rotor circuit (4), wherein the first rotor circuit (4) is configured to electromagnetically couple with the stator circuit (2), wherein the first rotor (3) is configured to be connected rotatably to the propellor; a second rotor (7) arranged to rotate around the machine axis (6) with respect to the stator (1), the second rotor (7) comprising a second rotor circuit (8), wherein the second rotor circuit (8) is configured to electromagnetically couple with the stator circuit (2); a coupling (10) configured to couple the rotation of first rotor (3) with the rotation of the second rotor (7) and to allow a relative movement of the first rotor with respect to the second rotor (7); a control circuit for controlling the relative rotational position of the second rotor (7) with respect to the first rotor (3) by controlling at least one parameter of the stator circuit (2), of the first rotor circuit (4) and/or of the second rotor circuit (7); wherein the mechanism for changing the blade-angle is configured to change the blade of the propellor based on the relative rotational position of the second rotor (7) with respect to the first rotor (3).

IPC Classes  ?

• H02K 16/02 - Machines with one stator and two rotors
• H02K 17/02 - Asynchronous induction motors
• B63H 3/02 - Propeller-blade pitch changing actuated by control element coaxial with propeller shaft, e.g. the control element being rotary
• B64C 11/44 - Blade pitch-changing mechanisms electric