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A synchronous motor drive using a voltage source inverter with position feedback is essentially

  • A.an induction motor drive with slip compensation
  • B.a brushless dc or PMSM drive, depending on the waveform
  • C.a load commutated inverter drive by another name
  • D.a cycloconverter drive limited to low frequencies

Answer: B

Whether the machine is wound field or magnet, position-fed inverter control is the same idea, and the waveform decides whether it is called brushless dc or a sinusoidal synchronous drive. The family is wider than the names suggest.

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