An induction engine or 3 phase induction motor is an AC electric engine in which the electric energy in the rotor needed to generate torque is obtained by electromagnetic induction from the magnetic field of the stator winding
An induction electric motor which connects with a 3-phase supply called 3-stage induction motor. Example fans,blowers, cranes,traction .It really is a ac engine. The primary drawback of DC motors may be the presence of commutator and brushes, which require regular Three Phase Motor maintenance and we can’t use DC electric motor in explosive and dirty environment. But induction motors are cheaper,tough,lighter,smaller,require much less maintenance and can use in dirty 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 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