Discussion
Match the machine with its rotor excitation.
1. Wound field synchronous 2. Permanent magnet synchronous 3. Synchronous reluctance
P. None at all Q. Magnets R. A direct current winding
Answer: A
Correct answer: 1-R, 2-Q, 3-P
A wound field machine carries a direct current winding on the rotor, fed through slip rings or a brushless exciter. A permanent magnet machine has magnets instead, so no excitation power and no field losses, but no controllable power factor either. A synchronous reluctance machine has neither: its rotor is simply shaped so that the reluctance differs along two axes, and torque arises from the rotor’s tendency to align with the field.
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