Abstract
This article starts with a presentation of the mathematical model for an asymmetrical two-phase induction motor drives (TPIM). This is followed by an analysis of TPIM behavior under variable frequency supply, with the running capacitor placed or removed from the circuit. This article attempts mainly to investigate the reasons for the lack of variable-speed drives. Consequently, the aptitude of the TPIMs for operating at variable speed is to be estimated and the suitable power electronic topologies identified. The most common form of a typical two-phase machine is the permanent split-capacitor motor (PSCM), usually recognized as the single-phase induction machine.
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