SYNCHRONOUS MACHINERY 



245 



Figs. 210 and 214 show four-pole single-phase windings with 

 only four of the six slots per pole used. 



The terminal e.m.f. of a two-phase winding distributed in two 

 slots per phase per pole is made up of two e.m.f. 's of value e 

 displaced 45 degrees from one another. It is e t = 1.848 e, Fig. 

 220, and the distribution factor is 



K _e L _1.848e 

 d ~2e~ 2e 



0.924. 



For a two-phase winding with three slots per phase per pole, 

 Figs. 211 and 215, the terminal e.m.f. is made up of three e.m.f. 's 

 displaced 30 degrees from one another. It is e t = 2.733 e, Fig. 221, 

 and the distribution factor is 



e t = 2.733 e 

 3e 3e 



0.911. 



FIG. 222. 



FIG. 223. 



The terminal e.m.f. of a three-phase winding distributed in 

 two slots per phase per pole, Figs. 212 and 216, is made up of two 

 e.m.f.'s of value e displaced 30 degrees from one another. It is 

 et = 1.931 e, Fig. 222, and the distribution factor is 



x=lL = L931 e 

 2e~ 2e 



= 0.966. 



