An induction motor which connects with a 3-stage supply called 3-phase induction motor. 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 much less 
maintenance and can use in filthy and explosive environment. Slip 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 three phase ac induction motor china 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 electric motor is important
Pole changing
Stator voltage control
V/f control
Slip power recovery
Rotor resistance control