ALTERNATING-CURRENT WINDING 



217 



to be the spread of a coil on one side, which is correct, as this 

 winding has one coil per phase per pole pair. 



The diagram for this winding is given in Fig. 252, where it is 

 shown star connected. The designation is four-pole, three-phase, 

 half -coiled, quadruple-coil, four -slot spiral winding, in two 

 ranges, Y-connected. 



Fin. 252. Four-pole, Three-phase, Half-coiled, Quadruple-coil, Four-slot 

 Spiral Winding in two ranges, Y-connected. 



THREE-RANGE WINDINGS. 



We now proceed to give photographs of a few typical three- 

 range windings and the corresponding winding diagrams. 



As these relate to large armatures with many coils, we shall 

 employ the developed type of winding diagram in connection with 

 them similar to that in Fig. 250. 



In the case of two-range windings we were able to distinguish 

 between the ranges by full and dotted lines, and for three ranges 



