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An induction motor is used for driving mechanical loads; Its efficiency is lesser than that of synchronous motor of the same output and voltage rating. Induction motor is cheaper than synchronous motor with same ratings; Induction motors are bit bigger in size than synchronous motor due to its construction.
When an ac supply is provided to stator of a 3-phase synchronous motor, stator winding produces rotating magnetic field. Due to the damper winding present in the rotor winding of the synchronous motor, machine starts as induction motor (Induction machine works on the principle of induction.hen the motor attains about 95% of the synchronous speed, the rotor windings is connected to exciter terminals and the rotor is magnetically locked by the rotating magnetic field of stator and it runs as a synchronous motor.