ALTERNATING-CURRENT WINDING 



223 



Thus the black and blue phases are identical, and there is less 

 liability of the phases being unbalanced. The armature is still 

 divisible without disturbing the coils, and a close inspection of the 

 horizontal joints in Fig. 255 will show that a coil is located on 



FIG. 259. Two-phase, Whole-coiled, Single-coil, Two-slot Spiral Windings 

 in two ranges with similar Coils. 



each side of the joint, and all that is disturbed by lifting off the 

 top half are the connectors between the coils. 



The connections between the coils will be seen clearly in Fig. 

 257, and the length and location of these show that the connections 



I N I | 8 I 



FIG. -260. Three-phase, Half-coiled, Single-coil, Uni-slot Spiral Winding 

 in two ranges with similar Coils. 



are as drawn in the diagram of Fig. 256, where every alternate 

 coil of each phase is reversed on its predecessor. There will thus 

 be one pole subtending each group of three coils, and the poles will 

 stand as shown in Fig. 256. 



This winding could be connected in the same way as Fig. 254, 

 when it would have twice the number of poles. 



Fig. 258 shows a winding in which all the coils are of the 



