Discussion
The number of brushes required by a lap winding is
Answer: B
Correct answer: equal to the number of poles
A lap winding has as many parallel paths as poles, and each path must be brought out at a brush, so the machine carries \( P \) brush arms - alternately positive and negative around the commutator. A wave winding, having only two paths, needs in principle only two brushes, though more are often fitted in practice to share the current and reduce the current density at each contact.
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