Discussion
Interpoles are given the same polarity as
Answer: A
Correct answer: the main pole ahead in the direction of rotation in a generator
The interpole must produce a flux that induces an emf opposing the reactance voltage in the commutating coil, and for a generator that requires the polarity of the main pole next in the direction of rotation. In a motor the rule reverses, which is why a machine that has been reconnected must have its interpole connections checked.
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