An induction engine or 3 stage induction motor is an AC electric engine in which the electric current in the rotor needed to produce 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-stage induction motor. Example supporters,blowers, cranes,traction .It really is a ac electric motor. The main drawback of DC motors may be the existence of commutator and brushes, which require frequent maintenance and we can not use DC engine in explosive and filthy environment. But induction motors are cheaper,tough,lighter,smaller,require much less maintenance and will use in dirty 
and explosive environment. Slide s is the imp Three Phase Motor 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 reverse voltage braking
Dynamic braking
But one thing swiftness control technique of induction electric motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control
