An induction electric motor or 3 phase induction motor is an AC electric motor in which the electric energy in the rotor had a need to generate torque is obtained by Three Phase Motor electromagnetic induction from the magnetic field of the stator winding
An induction engine which connects with a 3-stage supply called 3-phase induction motor. Example followers,blowers, cranes,traction .It is a ac motor. The primary drawback of DC motors is the existence of commutator and brushes, which require regular maintenance and we can not use DC engine in explosive and dirty environment. But induction motors are cheaper,durable,lighter,smaller,require less maintenance and will use in filthy and explosive environment. Slide 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 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