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An induction electric motor which connects with a 3-phase three phase ac induction motor china supply called 3-phase induction motor. Example enthusiasts,blowers, cranes,traction .It is a ac engine. The main drawback of DC motors is the presence of commutator and brushes, which require regular maintenance and we can’t use DC engine in explosive and dirty environment. But induction motors are cheaper,durable,lighter,smaller,require much less maintenance and will use in dirty and explosive environment. Slip s is the imp element 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 speed control technique of induction motor is important

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