3-Phase AC Induction Motor  Favorite

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

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Freescale 3-Phase AC Induction Motor application block diagram

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