An induction engine or 3 phase induction motor is an AC electric engine 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 electric motor which connects with a 3-stage supply called 3-phase induction motor. Example enthusiasts,blowers, cranes,traction .It really is a ac engine. The primary drawback of DC motors is the existence of commutator and brushes, which require frequent maintenance and we can not use DC motor in explosive and dirty environment. But induction motors are cheaper,rugged,Three Phase Motor lighter,smaller,require much less maintenance and can use in filthy and explosive environment. Slip s may be the imp aspect 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 reverse voltage braking
Dynamic braking
But one thing rate control technique of induction engine is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control
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