An induction electric motor or 3 phase induction motor is an AC electric engine in which the electric energy in the rotor had a need to produce 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 is a ac electric motor. The main drawback of DC motors may be the presence of commutator and brushes, which require frequent maintenance and we can’t use DC motor in explosive and dirty 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 numerous starting and braking condition.
Important starting methods are
Star-delta Three Phase Motor starter
Auto transformer starter
Ac voltage controller starter
Rotor resistance starter
Important braking methods are
Plugging or reverse voltage braking
But one thing swiftness control technique of induction motor is important
Stator voltage control
Slip power recovery
Rotor resistance control