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The speed of a synchronous motor changes only if

  • A.the terminal voltage applied to the stator changes
  • B.the supply frequency or the pole number changes
  • C.the load on the machine changes appreciably
  • D.the excitation of its field winding is altered

Answer: B

Load changes alter the torque angle rather than the speed, and excitation alters the power factor. Only frequency and pole number appear in the synchronous speed relation, which is why variable-speed operation needs a converter.

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