An induction electric motor or 3 stage induction motor is an AC electric engine in which the electric current in the rotor had a need to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding
An induction motor which connects with a 3-phase supply called 3-stage induction motor. Example followers,blowers, cranes,traction .It is a ac engine. The main drawback of DC motors may be the presence of commutator and brushes, which require regular maintenance and we can’t use DC electric motor in explosive and filthy environment. But induction motors are cheaper,durable,lighter,smaller,require less maintenance and will use in filthy 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 numerous starting and Three Phase Motor 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 speed control technique of induction engine is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control