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Coil span for 4-pole, 12-slot armature winding is_______

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Coil span for 4-pole, 12-slot armature winding is_______

(a) 24

(b) 48

(c) 8

(d) 3

I have been asked this question in an internship interview.

Asked question is from Armature Winding and Commutator topic in chapter Armature Windings of DC Machines

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The correct answer is (d) 3

The best 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, Slots in the armature winding= 12, Number of poles= 4.

YCS= 12/4= 3.

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