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Difference between Three Phase Induction Motor and Synchronous Motor A three phase Synchronous motor is a doubly excited machine, whereas an induction motor is a single excited machine. The armature winding of the Synchronous motor is energized from an AC source and its field winding from a DC source.
An induction motor therefore does not require mechanical commutation, separate-excitation or self-excitation for all or part of the energy transferred from stator to rotor, as in universal, DC and large synchronous motors. An induction motor's rotor can be either wound type or squirrel-cage type.ince rotation at synchronous speed would result in no induced rotor current, an induction motor always operates slower than synchronous speed. The difference, or slip, between actual and synchronous speed varies from about 0.5 to 5.0% for standard Design B torque curve induction motors.