초록 ▼

A multi-rotor A.C. electric drive device comprises a stator capable of producing a rotating or an alternating magnetic field and at least two rotors capable of producing an electromagenetic torque at asynchronous speed. The rotors are respectively called the main rotor and the auxiliary rotors. In l

A multi-rotor A.C. electric drive device comprises a stator capable of producing a rotating or an alternating magnetic field and at least two rotors capable of producing an electromagenetic torque at asynchronous speed. The rotors are respectively called the main rotor and the auxiliary rotors. In low speed operating mode of said device, the electromagnetic torque of the auxiliary rotor is amplified through a transmission portion and drives an output element together with the main rotor; after the auxiliary rotor is accelerated to the synchronous speed, an automatic unloading device releases the auxiliary rotor from the driving engagement with the output element. Examples illustrating several types of electromagnetic portion, transmission portion and the automatic unloading device are given.

대표청구항 ▼

[ I claim:] [1.] An A.C. electric device used for driving a machine, including an electromagnetic portion;said electromagnetic portion including a stator and at least a main rotor and an auxiliary rotor; said stator having a core for conducting magnetic flux, and a winding capable of generating a ro

[ I claim:] [1.] An A.C. electric device used for driving a machine, including an electromagnetic portion;said electromagnetic portion including a stator and at least a main rotor and an auxiliary rotor; said stator having a core for conducting magnetic flux, and a winding capable of generating a rotating or an alternating magnetic field when a suitable A.C. power is supplied; said main and auxiliary rotors also having their own respective cores for conducting magnetic flux, and both said rotors being capable of producing torques at asynchronous speed under the effect of a rotating or an alternating magnetic field;wherein said main rotor has a closed winding or a conductor equivalent to the closed winding for conducting induced current;said electromagnetic portion has a first closed magnetic circuit and a second closed magnetic circuit both linked with said winding or said conductor of the main rotor;the first magnetic circuit links with said winding of the stator, and includes the core of the stator and a part of the core of the main rotor, but not the core of the auxiliary rotor;the second magnetic circuit includes the other part of the core of the main rotor and at least a part of the core of the auxiliary rotor, but not the core of the stator;whereby, the current in the winding of the stator can excite in the first magnetic circuit a main flux capable of driving the main rotor to rotate and thereby induce a current in the winding or conductor of said main rotor;said induced current in the winding or conductor of the main rotor can excite in the second magnetic circuit a main flux capable of driving the auxiliary rotor to rotate; andsaid main flux excited by the current of said stator winding in said first magnetic circuit does not pass through the core of the auxiliary rotor.