Two-Speed Single-Winding Single-Phase Induction Motors Using Total Pole-Amplitude Modulation Techniques

Economic and efficient two-speed single-winding single-phase motors of any pole ratio are shown possible using normal coils with only eight terminals taken out from the winding. The rotor is of conventional squirrel-cage type. The new two-speed motors are characterized by good independent starting and running performances at both the speeds. The design is based on a novel theory known as the total pole-amplitude modulation method and is described in full.