An induction engine which connects with a 3-stage supply called 3-stage induction motor. Example supporters,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 frequent maintenance and we can not use DC electric motor in three phase ac induction motor china explosive and filthy environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and may use in filthy and explosive environment. Slip s may be the imp aspect in this type 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 reverse voltage braking
Dynamic braking
But one thing swiftness control technique of induction engine is important

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