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If a stator has 48 slots, 6 poles and 3 phase with narrow spread winding, then the third harmonic belt factor is ____________

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If a stator has 48 slots, 6 poles and 3 phase with narrow spread winding, then the third harmonic belt factor is ____________

(a) 0.9556

(b) 0.6407

(c) 0.1944

(d) None of the mentioned

The question was posed to me in an online quiz.

My enquiry is from EMF Polygon topic in portion Synchronous Machines of Electrical Machines

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Right option is (b) 0.6407

Explanation: q= (s/m)/p=k.Sk/k.Pk=Sk/Pk for fractional slot winding where k is the highest common factor between s/m and P, here q= 48/3*6 =16/6= 8/3 = Sk/Pk

The distribution factor for fractional slot winding’s is obtained by replacing q by Sk and kdn = (sinnγ/2)/(Sksinnγ/2Sk), if n=3, kd3=0.6407.

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