An induction electric motor or 3 stage induction motor can be an AC electric motor in which the electric current in the rotor Three Phase Motor needed to generate torque is obtained by electromagnetic induction from the magnetic field of the stator winding
An induction engine which connects with a 3-stage supply called 3-phase induction motor. Example enthusiasts,blowers, cranes,traction .It really is a ac electric motor. The primary drawback of DC motors may be the existence of commutator and brushes, which require frequent maintenance and we can’t use DC electric motor in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and can use in filthy and explosive environment. Slip s may be the imp factor in this kind 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 invert voltage braking
Dynamic braking
But one thing speed control technique of induction electric motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control