The AC induction motor is a rotating electric machine designed to operate from a three-phase source of alternating voltage. The stator is a classic three-phase stator with the winding displaced by 120°. Medium construction complexity, multiple fields on stator, cage on rotor High reliability (no brush wear), even at very high achievable speeds Medium efficiency at low speed, high efficiency at high speed Driven by multi-phase Inverter controllers Motor EMI good but... terrible EMI from inverter Sensorless speed control possible Low cost per horsepower, though higher than for 1-phase AC induction motor Higher start torque than for 1-phase, easy to reverse motor Inverter shoot-through' possible, requires dead-time' circuits and compensation
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