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For eliminating 7th harmonic from the emf ware of an alternator, what is the fractional pitch Winding

The value of $\alpha$ obtained above is the slot angle required for the elimination of the 7th harmonic.

Fractional pitch = \(\dfrac{\alpha}{\pi}\)

Substituting the value of \(\alpha\), we get:

Fractional pitch = \(\dfrac{\pi^{-1}}{7}\)

Simplifying, we get:

Fractional pitch = \(\dfrac{1}{7}\times\dfrac{1}{\pi}\)Therefore, the fractional pitch winding required to eliminate the 7th harmonic is \(\dfrac{1}{7}\times\dfrac{1}{\pi}\) or \(\dfrac{\pi}{7}\).