| 摘要 |
<p>A multi-rotor A.C. electrodynamic device comprises a stator productive of rotary or alternating magnetic field and at least two rotors productive of electromagnetic torque at asynchronous speed. The rotors are respectively referred to main rotor and auxiliary rotor(s). In low speed operating mode of said motor, the electromagnetic torque of the auxiliary rotor is amplified through the gear portion, and drives an output part together with the main rotor. After the auxiliary rotor was accelerated to the synchronous speed, an automatic unload device relieves the driving function from the auxiliary rotor. The given examples relate to said electrodynamic device, several kinds of electromagnetic portions and gear portions as well as two kinds of automatic unload devices.</p> |
