An induction electric motor or 3 stage induction motor can be an AC 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 engine which connects with a 3-stage supply called 3-phase induction motor. Example enthusiasts,blowers, cranes,traction .It really is a ac electric motor. The main drawback of DC motors may be the existence of commutator and brushes, which require regular maintenance and we can’t use DC electric motor in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and may use in filthy and explosive environment. Slide s may be the imp factor in this kind of motor.

There are 2 types of IM.

Squirrel cage IM

Slip ring IM

There are many starting and braking condition.

Important starting methods are

Star-delta starter

Auto transformer starter

Ac Three Phase Motor voltage controller starter

Rotor resistance starter

Important braking methods are

Regenerative braking

Plugging or invert voltage braking

Dynamic braking

But one thing speed control technique of induction electric motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control