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

An induction engine which connects with a 3-stage supply called 3-stage induction motor. Example supporters,blowers, cranes,traction .It is a ac motor. The primary drawback of DC motors may be the existence of commutator and brushes, which require frequent maintenance and we can not use DC engine in explosive and filthy environment. But induction motors are cheaper,durable,lighter,smaller,require much less maintenance and will use in dirty and explosive environment. Slide s is the imp element in this type of motor.

There are 2 types of IM.

Three Phase Motor Squirrel cage IM

Slip ring IM

There are numerous 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 speed control technique of induction motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control