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CBSE - XII Science - Physics - Current Electricity

ple.expain me what is three phase induction motor ?

Asked by 27th February 2008, 2:49 PM
Answered by Expert


3-Phase AC Induction Motor

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°.

                                In adjustable speed applications, AC motors are powered by inverters. The inverter converts DC power to AC power at the required frequency and amplitude. The inverter consists of three half-bridge units where the upper and lower switch are controlled complimentarily. As the power device's turn-off time is longer than its turn-on time, some dead-time must be inserted between the turn-off of one transistor of the half-bridge and turn-on of it's complementary device. The output voltage is mostly created by a pulse width modulation (PWM) technique.The 3-phase voltage waves are shifted 120° to each other and thus a 3-phase motor can be supplied.


  • Washing machines
  • Compressors
  • Air conditioning units
  • Pumps
  • Simple industrial drives
  • Electric cars
  • Industrial machines (most popular in world)

Answered by Expert 6th May 2008, 8:38 PM

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