three phase ac induction motor

An induction electric motor which connects with a 3-phase supply called 3-stage induction motor. Example fans,blowers, cranes,traction .It is a ac motor. The main drawback of DC motors may be the existence of commutator and brushes, which require regular maintenance and we can not use DC electric motor in explosive and filthy environment. But induction motors are cheaper,durable,lighter,smaller,require much less maintenance and can use in dirty and explosive environment. Slip s may be the imp aspect 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 voltage controller starter
Rotor resistance starter
Important braking methods are

Regenerative braking
Plugging or reverse voltage braking
Dynamic braking
But one thing acceleration three phase ac induction motor china control technique of induction engine is important

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