Three Phase Motor

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

An induction engine which connects with a 3-phase supply called 3-phase induction motor. Example supporters,blowers, cranes,traction .It is a ac motor. The primary drawback of DC motors may be the existence of commutator and brushes, which require Three Phase Motor frequent maintenance and we can’t use DC engine in explosive and dirty environment. But induction motors are cheaper,tough,lighter,smaller,require less maintenance and will use in filthy and explosive environment. Slip s is the imp aspect 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 methods are

Star-delta starter

Auto transformer starter

Ac voltage controller starter

Rotor resistance starter

Important braking methods are

Regenerative braking

Plugging or invert voltage braking

Dynamic braking

But one thing acceleration control technique of induction motor is important

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control