Page 767 - Basic Electrical Engineering

Figure 10.7 Distribution factor of the EMF equation

CB = 2CP = 2OC cos (90 − α/2)

CB = BD = DA = 2OC sin α/2

CA = 2 OC
and

Distribution factor,

or,

or,

Here, we have considered three slots per pole per phase. If m is the number
of slots per pole per phase, then

Distribution factor,