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True or false: a synchronous motor can improve the power factor of a factory while doing useful work.

  • A.True, if run over-excited while driving its load
  • B.False, since a motor can only draw reactive power from the supply
  • C.True, but only if it is run on no load as a condenser
  • D.False, since power factor correction requires capacitors only

Answer: A

Over-excited operation exports reactive power whatever mechanical duty the machine is performing, so the two benefits come together. That double return is a large part of why such machines were installed in works with many induction motors.

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