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An alternator has 9 slots/pole. What is the value of the pitch factor if each coil spans 8 slot pitches.

An alternator has 9 slots/pole. What is the value of the pitch factor if each coil spans 8 slot pitches. Correct Answer cos 10°

Slots/pole = 9

Coil span of 8 slots, i.e. coil is short pitched by 1 slot.

Chording angle, α = qγ

q = no. of slots short-pitched (In this case q = 1)

γ = angular span or angular distance covered by each slot

Angle covered by each pole = π (Electrical angle)

Here, γ = π/9 = 20°

α = γ (since q = 1) = 20°

Pitch factor, KP = cos (α/2) = cos (20°/2) = cos 10°.

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