Synchronous Motors
In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then

the excitation is said to be zero per cent
the torque generated is maximum
the motor is said to be fully loaded
the excitation is said to be hundred per cent

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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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