Discussion
The commutating zone of a dc machine is the region in which
Answer: A
Correct answer: a coil is short-circuited by a brush
The commutating zone is the angular region in which a brush spans two adjacent segments, short-circuiting the coil between them while its current reverses. It lies on the magnetic neutral axis, where the main field flux is nominally zero, so that no unwanted emf is induced during the reversal. Interpoles are placed there precisely to induce a controlled emf that cancels the reactance voltage and drives the reversal to completion.
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