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An interpole winding is sized to provide ampere-turns sufficient to

  • A.cancel the whole of the armature reaction under the main pole faces
  • B.supply the flux the main poles require at no load
  • C.match the ampere-turns of the shunt field winding exactly
  • D.cancel the armature ampere-turns in the interpolar zone and give the commutating flux

Answer: D

It has two jobs: neutralising the armature field where the coil is commutating, and then producing a further flux to induce an emf opposing the reactance voltage. Being in series with the armature, both scale with the load.

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