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A compensating winding is sized to provide ampere-turns equal to

  • A.the demagnetising component alone at the working brush shift
  • B.the ampere-turns the shunt field itself provides
  • C.the cross-magnetising component under the pole face
  • D.the whole of the armature ampere-turns per pole

Answer: C

Only the part of the armature field lying under the pole arc has to be cancelled, so the winding carries the armature current through a number of turns proportioned to the pole arc. Being in series, the correction follows the load automatically.

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