An induction motor or 3 stage induction motor can be an AC electric electric motor in which the electric energy in the rotor had a need to create torque is obtained by electromagnetic induction from the magnetic field of the stator winding
An induction electric motor which connects with a 3-phase supply called 3-stage induction motor. Example followers,blowers, cranes,traction .It really is a ac engine. The primary drawback of DC motors is the existence of commutator and brushes, which require regular maintenance and we can not use DC electric motor in Three Phase Motor explosive and filthy environment. But induction motors are cheaper,rugged,lighter,smaller,require less maintenance and may use in filthy and explosive environment. Slide s may be the imp element 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 invert 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