Explanation: kdn=(sinqnγ/2)/(qsinnγ/2) and examples will show that kdn is less than kd1. This has the effect of reducing the nth harmonic EMF in comparision with fundamental EMF. This is certainly an advantage of distributing the winding in slots. 8. 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
Answer:A
Explanation: kdn=(sinqnγ/2)/(qsinnγ/2) and examples will show that kdn is less than kd1. This has the effect of reducing the nth harmonic EMF in comparision with fundamental EMF. This is certainly an advantage of distributing the winding in slots. 8. 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
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