An induction engine which connects with a 3-phase supply called 3-stage induction motor. Example followers,blowers, cranes,traction .It really is a ac electric motor. The primary drawback of DC motors may be the presence of commutator and brushes, which require regular maintenance and we can’t use DC motor in explosive and filthy environment. But induction motors are cheaper,tough,lighter,smaller,require less maintenance and will use in filthy and explosive environment. Slide s is the imp aspect in this kind of motor.

There are 2 types of IM.

Squirrel cage IM
Slip ring IM
There are numerous starting and braking condition.

Important starting three phase ac induction motor 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 quickness control technique of induction motor is important

Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control