An induction electric motor which connects with a three phase ac induction motor china 3-phase supply called 3-phase induction motor. Example fans,blowers, cranes,traction .It is a ac engine. The primary drawback of DC motors is the presence of 
commutator and brushes, which require frequent maintenance and we can’t use DC motor in explosive and dirty environment. But induction motors are cheaper,tough,lighter,smaller,require much less maintenance and can use in filthy and explosive environment. Slide s may be the imp factor 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 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