As shown in the illustration of a DC machine which is configured as a generator, what is the polarity of the interpoles as compared to the main field poles? EL-0052

Correct Answer: Option B — in the direction of rotation, the preceding interpole should have the same polarity as the following main pole

Interpoles on direct current generators minimize armature reaction and commutation sparking. In the direction of rotation, the preceding interpole must possess the same polarity as the following main pole to properly neutralize armature flux.