An induction electric motor or 3 phase induction motor can be an AC electric engine in which the electric energy in the rotor had a need to generate 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 fans,blowers, cranes,traction .It is a ac electric motor. The primary drawback of DC motors is the existence of commutator and brushes, which require regular maintenance and we can not use DC motor in explosive and filthy environment. But induction motors are cheaper,tough,lighter,smaller,require much less maintenance and may use in 
dirty and explosive environment. Slip s is the imp factor in this type of motor.
There are 2 types of IM.
Squirrel cage IM
Slip ring IM
There are various starting and braking condition.
Three Phase Motor 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 motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control