146 



ARMATURE CONSTRUCTION 



Let yb= 11 and yf= 9. The diagram is given in Fig. 172. 



Suppose with the same value for the mean pitch, i.e. 

 y=10, we had taken yl = y + 3 (instead of 2/+l) = 10 + 3 = 13, 

 and y/=y-3 (instead of y-l) = 10-3 = 7, then the diagram 

 becomes that shown in Fig. 173. 



^/""/////MW//' -//. 



s 



i 



FIG. 171. Winding Diagram for 2-circuit 6-pole Armature, 62 Conductors. 



yf=v ; 2/&=ii- 



We may also take this same number of face conductors, 

 i.e. 58, and construct 4-pole windings. For these cases ?i = 4, 

 and our formula becomes 



y _60or56 = 16oru 



Let us take the solution which gives 



y=15. 



