An induction motor which connects with a 3-phase supply called 3-stage induction motor. three phase ac induction motor china Example fans,blowers, cranes,traction .It is a ac engine. The main drawback of DC motors is 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,rugged,lighter,smaller,require less maintenance and may use in dirty and explosive environment. Slip s is the imp element 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 quickness control technique of induction engine is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control