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A 3-phase, 4-pole alternator has 48 stator slots carrying a 3-phase distributed winding. Each coil of the winding is short chorded by one slot pitch. The winding factor is given by ______________

A 3-phase, 4-pole alternator has 48 stator slots carrying a 3-phase distributed winding. Each coil of the winding is short chorded by one slot pitch. The winding factor is given by ______________ Correct Answer (cot7.5)/8

Slots per pole = 48/4 = 12 ⇒ γ=180/12=15° and q=48/4∗3=4 coil of the winding is short chorded by one slot pitch ⇒ ε=γ=15°, Kw=Kp∗Kd = cos7.5(sin(4∗15/2))/(4∗sin(15/2)) = (cot7.5)/8.

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