An induction electric motor or 3 phase induction motor can be an AC electric electric motor in which the electric energy in the rotor needed 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-phase induction motor. Example fans,blowers, cranes,traction .It really is a ac engine. The primary drawback of DC motors may be the existence of commutator and brushes, which require regular maintenance and we can not use DC motor in explosive and dirty environment. But induction motors are cheaper,durable,lighter,smaller,require much less maintenance and will use in dirty 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 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 invert voltage braking
Dynamic braking
But one thing speed Three Phase Motor control technique of induction motor is important
Pole 
changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control