An induction engine or 3 phase induction motor is an AC electric electric motor in which the electric current in the rotor needed to create 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 followers,blowers, cranes,traction .It really 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,tough,lighter,smaller,require much less maintenance and can use in dirty and explosive environment. Slide s is the imp aspect 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 reverse voltage braking
Dynamic braking
But one thing speed control technique of induction motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control