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A permanent magnet synchronous motor differs from a wound field machine in that its excitation

  • A.is supplied through slip rings from a separate converter
  • B.is provided by currents induced in the rotor from the stator field
  • C.comes from the damper winding set into the pole faces
  • D.cannot be adjusted

Answer: D

The magnets fix the flux, which makes the machine compact and efficient but removes power factor control and complicates field weakening. Weakening is still possible by driving current on the direct axis to oppose the magnets.

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