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A rotating machine cannot use grain-oriented steel to full advantage because

  • A.the material is too brittle to be punched into slots
  • B.its saturation flux density is too low for a machine
  • C.its resistivity is too low for the frequencies involved
  • D.the flux direction changes relative to the lamination

Answer: D

The flux in a stator tooth runs radially and in the back iron circumferentially, so no single rolling direction suits the whole lamination. Non-oriented steel, with more nearly equal properties in all directions in the plane, is used instead.

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