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True or false: eddy current loss and hysteresis loss both rise in direct proportion to frequency.

  • A.True, the two losses being physically the same effect
  • B.False, eddy current loss rising with the square of the frequency
  • C.True, both mechanisms depending on the rate of reversal
  • D.True, provided the flux density is held constant

Answer: B

Hysteresis loss rises with the first power of frequency, since one loop area is dissipated per cycle, while eddy current loss rises with the square, since both the induced voltage and the resulting current grow with frequency. Separating them by measurement at two frequencies exploits this difference.

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