An induction engine or 3 phase induction motor can be an AC electric motor in which the electric current in the rotor had a need to create torque is obtained by electromagnetic induction from the magnetic field of the stator winding
An induction engine which connects with a 3-phase supply called 3-stage induction motor. Example enthusiasts,blowers, Three Phase Motor cranes,traction .It is a ac engine. The main drawback of DC motors is the presence of commutator and brushes, which require frequent maintenance and we can’t use DC engine in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require less maintenance and may use in dirty and explosive environment. Slide s is the imp element in this kind of motor.
There are 2 types of IM.
Squirrel cage IM
Slip ring 
IM
There are numerous 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 engine is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control
