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The rotating field of a three-phase machine has a magnitude that is

  • A.constant, at one and a half times the peak per-phase value
  • B.pulsating between zero and its peak value twice in every cycle of the supply
  • C.equal to the peak value of one phase alone
  • D.zero at every instant except at the peaks of each phase

Answer: A

Adding three sinusoidally varying fields displaced by a hundred and twenty degrees in both space and time gives a resultant of constant magnitude that revolves. It is that constancy which makes the three-phase machine so much smoother than the single-phase one.

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