Discussion
Match the remedy with the problem it addresses.
1. Interpoles 2. Compensating winding 3. Equalizer rings
P. Circulating current between parallel paths Q. Reactance voltage in the commutating coil R. Flux distortion under the pole faces
Answer: A
Correct answer: 1-Q, 2-R, 3-P
Interpoles are wound in series with the armature and produce a flux that induces an emf opposing the reactance voltage in the commutating coil. A compensating winding is embedded in the pole faces, also carrying armature current, and cancels the flux distortion armature reaction produces under the poles. Equalizer rings connect points of a lap winding that should be at equal potential, so that any circulating current caused by unequal pole fluxes passes through them rather than through the brushes.
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