The synchronous motor ____.
A) is an induction motor
B) must have DC excitation to operate
C) operate at a constantly changing speed
D) does not have the ability to correct its own power factor

Question

Quizplus · Accepted Answer

The synchronous motor requires DC excitation to create a magnetic field in the rotor. This is usually achieved through a separate DC power source or through a "brushless" design that uses electronic circuits to provide the excitation. Therefore, option A is incorrect. Unlike asynchronous or induction motors that operate at a constantly changing speed depending on the load, synchronous motors operate at a fixed speed determined by the frequency of the power supply and the number of poles in the motor. Therefore, option C is incorrect. Synchronous motors have the ability to correct their own power factor by adjusting the excitation to the required level. Therefore, option D is incorrect.

The Synchronous Motor ____