An induction Three Phase Motor electric motor or 3 stage induction motor can be an AC electric motor in which the electric energy 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-phase induction motor. Example fans,blowers, cranes,traction .It is a ac electric motor. The primary drawback of DC motors is the existence of commutator and brushes, which require regular maintenance and we can’t use DC electric motor in explosive and dirty environment. But induction motors are cheaper,tough,lighter,smaller,require less maintenance and may use in dirty 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 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 control technique of induction electric motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control