Synchronous Motors
A synchronous motor can develop synchronous torque

when under loaded
while over-excited
below or above synchronous speed
only at synchronous speed

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

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

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