An induction engine or 3 stage induction motor can be an AC electric engine in which the electric energy in the rotor had a need to produce 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 followers,blowers, cranes,traction .It really is a ac engine. The main drawback of DC motors may be the presence of commutator and brushes, which require frequent maintenance and we can not use DC motor in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and can use in filthy and explosive environment. Slide s is the imp element 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 Three Phase Motor invert voltage braking

Dynamic braking

But one thing speed control technique of induction engine is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control