Electrical Machines
In DC machines, the interpoles are provided

 to counteract the reactance voltage and the cross-magnetizi
  both (B) and (C).
 to counteract demagnetizing effect of armature mmf in commutating zone.
  to make commutation spark less.

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Electrical Machines
DC Motor

  dc series motor.
  dc shunt motor with field weakening.
  dc shunt with armature resistance control.
  dc compound motor.

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