Question

In an alternator, if the winding is short-pitched by 60 electrical degrees, its pitch factor will be:
1. 1
2. 0.28
3. 0.75
4. 0.866

Answer 1

Correct Answer - Option 4 : 0.866

Concept:

Pitch factor for nth harmonic is given by,

\({k_c} = \cos \frac{{n\alpha }}{2}\)

Where α is short pitch angle in degrees

Calculation:

Given that, short pitch angle (α) = 60°

Pitch factor = cos (60/2) = cos 30 = 0.866