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For a 2-pole DC machine with coil span equal to 6, what are the number of commutator segments?

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For a 2-pole DC machine with coil span equal to 6, what are the number of commutator segments?

(a) 3

(b) 12

(c) 4

(d) 8

This question was posed to me during an internship interview.

My question comes from Armature Winding and Commutator topic in portion Armature Windings of DC Machines

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The correct answer is (b) 12

Explanation: Coil span is defined as a ratio of number of slots in the armature winding which are also equal to the number of commutator segments to the number of poles. Here, Number of poles= 2, Slots in the armature winding= S= P* YCS. Here, YCS= 6, P=2. Thus S=12. C=S=Number of commutator segments.

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