Synchronous Motors
The net armature voltage of a synchronous motor is equal to the

arithmetic difference of Eb and V
vector difference of Eh and V
arithmetic sum of Eb and V
vector sum of Eb and V

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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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