ALTERNATING-CURRENT WINDING 



187 



wound, could be divided into three sections, each section contain- 

 ing one of these groups of coils, without interfering with the coils 

 themselves. If three radial lines are drawn between conductors 

 6c and IA, 2c and SA, 4c and 5 A, the armature can be divided 

 at the points marked by these lines, it being only necessary to 

 break the connection between the coils. This is a good point to 

 realise, especially with very large armatures, which, if wound 



FIG. 228. Three-phase Whole-coiled Winding (one coil per phase per pole). 



in this way, can be built and transported in several sections, each 

 fully wound. The style of winding has, however, several dis- 

 advantages, a prominent one of which is that the crossings of the 

 end portions of the coils do not permit of a simple arrangement. 

 The end view underneath Fig. 229 shows that one coil of each 

 phase crosses both of the other phases. 



The coils would have to be laid up in three ranges at the ends 

 of the armature in either of the ways shown in Fig. 230 e, f, 

 and g. We shall have more to say on the number of ranges for 

 various windings, and also on the matter of dividing the armature 



