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Armature reaction in a dc machine is the effect of

  • A.the armature current's own magnetic field on the main flux
  • B.the resistance of the armature winding on the terminal voltage
  • C.the brush contact drop on the terminal voltage of the machine
  • D.the commutator's switching on the shape of the output waveform

Answer: A

The armature's field sits across the main one, distorting it and shifting the magnetic neutral axis, and saturation makes the net effect slightly demagnetising. Interpoles and compensating windings exist to deal with it.

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