Synchronous Motors
Change of D.C. excitation of a synchronous motor changes

Applied voltage of the motor
Power factor of power drawn by the motor
Motor speed
Any of the above

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

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

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