An induction engine or 3 stage induction モーター is an AC electric motor in which the electric energy in the rotor had a need to produce 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-stage induction motor. Example enthusiasts,blowers, cranes,traction .It is a ac engine. The primary drawback of DC motors may be the existence of commutator and brushes, which require frequent maintenance and we can't use DC motor in explosive and filthy environment. But induction motors are Three Phase Motor cheaper,rugged,lighter,smaller,require less maintenance and may use in filthy 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 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 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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