Three Phase Motor

An induction electric motor or 3 phase induction motor can be an AC electric engine in which the electric current in the rotor needed to generate torque is obtained by electromagnetic induction from the magnetic field of the stator winding

An induction motor which connects with a 3-phase supply called 3-stage induction motor. Example fans,blowers, cranes,traction .It is a ac motor. The main drawback of DC motors may be the existence of commutator and brushes, which require frequent maintenance and we can’t use DC electric motor in Three Phase Motor explosive and dirty environment. But induction motors are cheaper,durable,lighter,smaller,require less maintenance and will use in dirty and explosive environment. Slip s is the imp aspect in this kind of motor.

There are 2 types of IM.

Squirrel cage IM

Slip ring IM

There are various starting and braking condition.

Important starting methods are

Star-delta starter

Auto transformer starter

Ac voltage controller starter

Rotor resistance starter

Important braking methods are

Regenerative braking

Plugging or reverse voltage braking

Dynamic braking

But one thing acceleration control technique of induction motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control

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