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A self-controlled synchronous motor drive uses

  • A.rotor position feedback to set the inverter firing
  • B.an open-loop frequency reference with no feedback of any kind
  • C.the damper winding to bring the rotor into step at each change of speed
  • D.a fixed frequency supply with excitation control alone

Answer: A

Because the inverter is commanded from where the rotor actually is, the machine cannot fall out of step however the load or the reference changes. The arrangement behaves much like a dc machine with electronic commutation.

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