ALTERNATING-CURRENT WINDING 



203 



TABLE XIV. 



SLOTS PER POLE PER PHASE FOR THE WINDINGS IN FIGS. 237, 



238, AND 239. 



TABLE XV. 



SLOTS PER POLE FOR THE WINDINGS IN FIGS. 237, 238, AND 239. 



As an example of the use of these tables let us consider a three- 

 phase, half-coiled, triple coil spiral winding in two ranges. 



Fig. 239 shows us that the half-coiled triple coil winding may 

 be either of Figs. 239 k or 239 K. Table XIII. shows that of these 

 two, k is two-range, whereas K is three-range. Hence Fig. 239 k is 

 the winding described by the above title. From Table XIV. we 

 ascertain that this winding has three slots per pole per phase, i.e. it 

 is a three-slot winding. By multiplying by the number of phases 

 3, or by reference to Table XV., we have the number of slots per 

 pole = 9. 



In describing a winding by means of this nomenclature it may 

 be useful to prefix or suffix the title by the number of slots per pole 

 per phase ; thus one-slot (or uni-slot), two-slot, five-slot, etc., but 



