Discussion
A reluctance motor runs at synchronous speed because
Answer: A
Correct answer: its salient rotor locks to the revolving field
A reluctance motor starts as an induction machine on its cage and then pulls into synchronism, after which the saliency of the rotor holds it locked to the revolving field. It needs no rotor excitation of any kind, which makes it simple, but the reluctance torque available limits it to modest ratings.
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