초록 ▼

The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics

The rotor cage of a motor is extended, a second stator is coupled to this extended rotor cage, and the windings have the same number of poles. The motor torque and speed can be controlled by either injecting energy into or extracting energy out from the rotor cage. The motor produces less harmonics than existing doubly-fed motors. Consequently, a new type of low cost, high efficiency drive is produced.

대표청구항 ▼

[ I claim:] [1.] In an electric motor, an improvement comprising:a first stator assembly;a second stator assembly asymmetrical to and not magnetically coupled to said first stator assembly; andan extended cage rotor having correspondingly asymmetrical first and second rotor sections arranged along n

[ I claim:] [1.] In an electric motor, an improvement comprising:a first stator assembly;a second stator assembly asymmetrical to and not magnetically coupled to said first stator assembly; andan extended cage rotor having correspondingly asymmetrical first and second rotor sections arranged along nontransposed extended cage bars, said first rotor section magnetically coupled to said first stator assembly, and said second rotor section magnetically coupled to said second stator assembly; either or both of said first or second stator assemblies including a stator lamination stack, a toroidal winding disposed around said stator lamination stack, and a magnetic flux leakage shield made of nonmagnetic metal disposed between said stator lamination stack and said toroidal winding.