An induction electric motor or 3 stage induction motor can be an AC electric engine in which the electric current in the rotor had a need to produce torque is Three Phase Motor 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 supporters,blowers, cranes,traction .It really 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 not use DC electric motor in explosive and dirty environment. But induction motors are cheaper,tough,lighter,smaller,require much less maintenance and will use in dirty and explosive environment. Slide s may be the imp element in this type 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 acceleration control technique of induction electric motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control