Page 766 - Basic Electrical Engineering
P. 766
algebraic sum. With K and K into consideration, the equation for the
p
d
induced EMF is
E = 4.44 ϕf T K K V (10.2)
d
p
The factor K is used in the EMF equation due to the use of winding being
d
distributed rather than concentrated in two slots. The factor K is due to the
p
use of short-pitch coils rather than full-pitch coils.
The values of K and K are derived as follows.
d
p
10.8.2 Distribution Factor
Distribution factor is defined as the ratio of the EMF induced in the
distributed winding in a phase to the EMF induced in a concentrated winding.
In Fig. 10.7, the stator with a number of slots have been shown. The
conductors are placed in the slots. The EMFs induced in the conductors are
e , e , e , etc. These EMFs are to be added vectorially as shown in Fig. 10.7.
2
3
1
Let α be the angle between two slots.
