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An induction electric motor or 3 phase induction motor can be an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding

An induction electric motor which connects with a 3-phase supply called 3-stage induction motor. Example enthusiasts,blowers, cranes,traction .It really is a ac motor. The primary drawback of DC motors is the presence of commutator and brushes, which require regular maintenance and we can not use DC engine in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and may use in filthy and explosive environment. Slip s is 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 Three Phase 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 swiftness control technique of induction engine is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control