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