CONTINUOUS-CURRENT WINDINGS 



157 



multiplicity and the re-entrancy. They are equally applicable to 

 two-circuit and multiple-circuit windings. 



TABLE XT. 



SHOWING MULTIPLICITY AND RE-ENTRANCY OF MULTIPLEX WINDINGS. 



SPECIAL TWO-CIRCUIT WINDINGS. 

 From the formula 



for two-circuit simplex windings, it follows that for four-pole 

 windings we cannot have four conductors per slot. 



It is with four-pole designs that this is most often found 

 embarrassing, but the general rule applying to any number of 

 poles is as follows : 



" In the ordinary two-circuit single winding, C is always such 

 a number that the number of conductors per slot, and n the 

 number of poles, cannot have a common factor greater than 2." 



There are, however, several ways of evading this rule. These are 

 illustrated by the diagrams in Figs. 190, 191, 192, and 193, each of 

 which represents a two-circuit simplex winding with 40 face con- 

 ductors. Were these arranged four per slot, we should have 10 slots, 

 which is, of course, absurd for a four-pole machine. This small 

 number has been taken merely in order to obtain simple diagrams. 

 The principles illustrated are, of course, applicable to designs with 

 large numbers of slots. In the winding of Fig. 190, the sequence 

 of connections is clockwise until 39 conductors have been traversed ; 

 then, however, the direction of progression is reversed and the 



