Page 768 - Basic Electrical Engineering

10.8.3 Pitch Factor

The pitch factor is due to the use of short-pitch coils as has been shown in

Fig. 10.8. If the winding is made with full-pitch coils then, pitch factor K is
p
equal to 1. The pitch factor is defined as the ratio of the EMF induced in a
short-pitch coil to the EMF induced in a full-pitch coil. Let β be the angle
through which the coil is made less than the full pitch. The pitch factor, K is
p
the ratio of the vector sum of the EMFs induced in the coil sides to the

algebraic sum of the EMFs.

K = [from Fig. 10.8 (b)]
P

Figure 10.8 Pitch factor due to use of short-pitch coil

or,