An induction electric motor or 3 stage induction motor is an AC electric engine 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 electric motor which connects with a 3-phase supply called 3-stage induction motor. Example followers,blowers, cranes,traction .It really is a ac electric motor. 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 filthy environment. But induction motors are cheaper,rugged,lighter,smaller,require less maintenance and can 
use in dirty and explosive environment. Slide s may be the imp factor 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
Three Phase Motor Dynamic braking
But one thing acceleration control technique of induction motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control