An induction electric motor or 3 stage 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 motor which connects with a 3-stage supply called 3-phase induction motor. Example fans,blowers, cranes,traction .It really is a ac motor. The main drawback of DC motors is the presence of commutator and brushes, which require frequent maintenance and we can’t use DC engine in explosive and dirty environment. But induction motors are cheaper,tough,lighter,smaller,require much less maintenance and can use in dirty 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 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 velocity control technique of induction electric motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control