FIELD: electrical engineering.
SUBSTANCE: invention relates to the field of electrical engineering, in particular to hybrid induction motors. Hybrid induction motor comprises a fixed stator, an independently rotating outer rotor and an inner rotor fixed to a motor shaft. In one embodiment the outer rotor includes spaced apart first bars and permanent magnets, and the inner rotor includes spaced apart second bars. In another embodiment the outer rotor includes angularly spaced apart first bars but no permanent magnets, and the inner rotor includes permanent magnets and may also include angularly spaced apart second bars. Outer rotor is initially accelerated by cooperation of a rotating stator magnetic field with the first bars. As the outer rotor accelerates towards synchronous RPM, the inner rotor is accelerated to transition to efficient synchronous operation. Outer rotor thus acts as a clutch to decouple the inner rotor from the rotating stator magnetic field at startup and to couple the inner rotor to the rotating stator magnetic field at synchronous speed.
EFFECT: higher motor efficiency.
11 cl, 41 dwg
