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A 4 pole DC machine has 36 number of armature conductors. What is the pole pitch?

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A 4 pole DC machine has 36 number of armature conductors. What is the pole pitch?

(a) 9

(b) 1/9

(c) 9^2

(d) 1/9^2

I had been asked this question in homework.

My question is taken from Design of Armature in section Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

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The correct choice is (a) 9

Easy explanation: Pole pitch = Number of armature slots/pole

Pole Pitch = 36/4 = 9.

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