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AC Synchronous Motor

An AC synchronous motor is a motor driven by alternating current (AC) in which the motor rotor spins at a multiple of the line frequency and the number of pairs of poles that create the magnetic field. Unlike an induction motor, a synchronous motor has zero slip associated with its operation. Syncronous motors are constant-speed motors and are therefore very efficient at converting AC power to mechanical work. The two types of AC synchronous motors are nonexcited and DC-excited.

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