Synchronous Motors
The magnitude of field flux in a 3-phase synchronous motor

Remains constant at all loads
Varies with power factor
Varies with speed
Varies with the load

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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 has large air gap
stator supply is relieved of responsibility of producing magnetic field
synchronous motor runs at synchronous speed

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