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A synchronous reluctance motor has the drawback of

  • A.requiring a damper winding for stable operation
  • B.a lower power factor than a magnet machine
  • C.requiring slip rings and brushes for its rotor excitation
  • D.being unable to run at synchronous speed under any load

Answer: B

Because all the flux must be supplied from the stator, the magnetising current is larger and the power factor poorer than in a machine with magnets. Modern rotor designs with deep flux barriers have narrowed the gap considerably.

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