Synchronous Motors
In case one phase of a three-phase synchronous motor is short-circuited the motor will

take less than the rated load
not start
run with excessive vibrations
run at 2/3 of synchronous speed

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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
synchronous motor runs at synchronous speed
mechanical load on the motor can be adjusted

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