An induction motor which connects with a 3-phase supply called 3-phase induction motor. Example supporters,blowers, cranes,traction .It is a ac electric motor. The primary drawback of DC motors is the existence of commutator and brushes, which require regular maintenance and we can’t use DC electric motor in explosive and dirty environment. But induction motors are cheaper,rugged,lighter,smaller,require less maintenance and will use in dirty 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 numerous starting and braking condition.
three phase ac induction motor 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 rate control technique of induction motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control