Synchronous motor - Wikipedia
https://en.wikipedia.org/wiki/Synchronous_motor
OverviewTypesControl techniquesSynchronous speedConstructionOperationStarting methodsApplications, special properties, and advantagesA synchronous electric motor is an AC electric motor in which, at steady state, the rotation of the shaft is synchronized with the frequency of the supply current; the rotation period is exactly equal to an integer number of AC cycles. Synchronous motors use electromagnets as the stator of the motor which create a magnetic field that rotates in time with the oscillations of the current. The rotor with permanent … gif
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