Synchronous Motors
Mostly, synchronous motors are of

Salient pole type machines
Smooth cylindrical type machines
Alternator type machines
Induction type machines

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Synchronous Motors
The power factor of a synchronous motor is better than that of induction motor because

mechanical load on the motor can be adjusted
synchronous motor runs at synchronous speed
synchronous motor has large air gap
stator supply is relieved of responsibility of producing magnetic field

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