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Single-phase induction motors
The development of a rotating field in an induction machine requires a set of currents displaced in phase (as shown in the ) flowing in a set of stator windings that are displaced around the stator periphery. While this is straightforward where a three-phase supply is available, most commercial and domestic supplies are only of a single phase, typically with a voltage of 120 or 240 volts. There are several ways in which the necessary revolving field can be produced from this single-phase supply.