Two-Speed Single-Winding Single-Phase Induction Motor Using Nonintegral Cycle Modulation Techniques

Economic and efficient two-speed, single-winding, single-phase induction motor of any pole ratio using normal coils with independent starting and good running performances is shown possible with only four terminals taken out from the winding. The rotor is of conventional squirrel-cage type. The design is based on a novel theory known as nonintegral cycle modulation and is described in full. Experimental results are presented in support of the theory for a 4/6 pole combination in prototype machines.