An induction motor which connects with a 3-stage supply called 3-stage induction motor. Example fans,blowers, cranes,traction .It really is a ac electric motor. The primary drawback of DC motors may be the presence of commutator and brushes, which require regular maintenance and we can’t use DC motor 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 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 three phase ac induction motor china 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