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An induction electric motor or 3 phase induction motor is an AC electric engine in which the electric energy in the rotor had a need 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 followers,blowers, cranes,traction .It is a ac electric motor. The main drawback of DC motors may be the presence of commutator and brushes, which require frequent maintenance and we can’t use DC motor in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require much 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 numerous starting and braking condition.

Important starting methods are

Star-delta Three Phase Motor 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 motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control