Induction Motor Principle

Induction motor is an asynchronous AC motor in which supply is given to the stator and the rotor gets induced emf.

Principle : 

When multi phase supply is fed on the stator, it creates a rotating magnetic field. This induces an EMF in the rotor is closed, a current passes through the rotor winding which creates a magnetic field.

dorota magnetic field will act in such a manner so as to oppose the main magnetic field and hence the rotor will try to catch upon follow the rotating stator magnetic field. Finally the rotor will obtain a constant speed.