Three Phase Motor

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

Pole changing

Stator voltage control

V/f control

Slip power recovery

Rotor resistance control