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 engine. The primary drawback of DC motors is the presence of commutator and brushes, which require regular maintenance and we can not use DC engine in explosive and filthy environment. But induction motors are cheaper,durable,lighter,smaller,require less maintenance and will 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 numerous 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 velocity three phase ac induction motor china control technique of induction engine is important
Pole changing
Stator 
voltage control
V/f control
Slip power recovery
Rotor resistance control