Explanation: The phase displacement will be given by slot angular pitch γ. 7. A 3-phase machine has integral slot winding with fundamental distribution factor kd1, the distribution factor for nth harmonic kdn is ____________
A. less than kd1
B. more than kd1
C. equal to kd1
D. depends upon the number of slots and poles
Answer:A
Explanation: The phase displacement will be given by slot angular pitch γ. 7. A 3-phase machine has integral slot winding with fundamental distribution factor kd1, the distribution factor for nth harmonic kdn is ____________
A. less than kd1 B. more than kd1 C. equal to kd1 D. depends upon the number of slots and poles
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 ____________