An induction motor which connects with a 3-stage supply called 3-phase induction motor. Example followers,blowers, cranes,traction .It is a ac motor. The primary drawback of DC motors may be the presence 
of commutator and brushes, which require regular three phase ac induction motor china maintenance and we can not use DC motor in explosive and filthy environment. But induction motors are cheaper,rugged,lighter,smaller,require much less maintenance and will use in dirty and explosive environment. Slip s is the imp aspect in this type of motor.
There are 2 types of IM.
Squirrel cage IM
Slip ring IM
There are various 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
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