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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) 8This 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

Answer»

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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