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Interpoles are fitted to a dc machine in order to

  • A.reduce the ripple in the current supplied by the converter
  • B.improve commutation under load
  • C.increase the main field flux and so raise the torque developed
  • D.provide the starting torque the machine needs at standstill

Answer: B

Small poles between the main ones, carrying the armature current, cancel the reactance voltage in the coil being commutated. Their winding is in series with the armature so that the correction tracks the load automatically.

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