AC Synchronous Motor

To rotate a motor, a rotary magnetic field has to be created. In AC synchronous motors, the magnetic field synchronously rotates with the applied voltage. The reason for calling these motors synchronous motors is because their rotation rate is equal to the frequency of the applied voltage. AC asynchronous motors rotate slower than applied voltage frequency. Synchronous rotation of an AC synchronous motor depends on the number of pole pairs and frequency.

Synchronous rotation rate is not dependant on the load of the motor. The rotor rotates at the same rate of the rotating magnetic field rate.

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