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What is the value of Yb for a lap winding with a 4-pole, 12-slot armature with two coil sides/slot. Assume single-turns coils.(a) 3(b) 5(c) 7(d) 9I had been asked this question at a job interview.I want to ask this question from Lap Winding topic in portion Armature Windings of DC Machines

Answer»

Correct answer is (c) 7

Easy 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.

Yb = 2YCS +1= 7.



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