Three Phase Motor

An induction motor or 3 stage induction motor can be an AC electric electric motor 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 really is a ac motor. The primary drawback of DC motors is the existence of commutator and brushes, which require regular maintenance and we can not use DC motor in explosive and filthy environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and can 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 Three Phase Motor 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 rate control technique of induction electric motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control