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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 engine. The main drawback of DC motors is the existence of commutator and brushes, which require frequent maintenance and we can’t use DC engine in explosive and filthy environment. But induction motors are cheaper,durable,lighter,smaller,require less maintenance and can use in filthy and explosive environment. Slip s may be the imp factor 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
three phase ac induction motor china 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