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What is the value of Yf for a lap winding with a 4-pole, 12 commutator segments, with two coil sides/slot.? (Assume single-turns coils -retrogressive winding).

What is the value of Yf for a lap winding with a 4-pole, 12 commutator segments, with two coil sides/slot.? (Assume single-turns coils -retrogressive winding). Correct Answer 9

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= Number of commutator segments= 12, Number of poles= 4. YCS= 12/4= 3. Yb = 2YCS +1= 7 Yf =Yb + 2= 7+2= 9.

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