An induction electric motor or 3 stage induction motor can be an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding
An induction motor which connects with a 3-stage supply called 3-phase induction motor. Example fans,blowers, cranes,traction .It really is a ac motor. The main drawback of DC motors is the presence of commutator and brushes, which require frequent maintenance and we can’t use DC engine in explosive and dirty environment. But induction motors are cheaper,tough,lighter,smaller,require much less maintenance and can use in dirty and explosive environment. Slip s is 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 velocity control technique of induction electric motor is important
Stator voltage control
Slip power recovery
Rotor resistance control