376 ELECTRICAL ENGINEERING 



and the alternating current in the winding is 



= =/ = . 545 ,. 



\/3 3 V3 



(350) 



238. n-phase Converter. For an n-phase converter, Fig. 

 357, the winding must be tapped at n equidistant points. The 

 e.m.f. between each of the rings and the neutral point or the 

 " star " e.m.f. is as before 





2V2 



FIG. 357. n-phase converter. 



The e.m.f. between rings or the e.m.f. between lines is the vector 

 difference between two e.m.fs. E$ displaced at -- radians. (Fig. 

 358.) Thus 



n 



Esin- 





. 



. . . . (351) 



The power input is 



nE s !i = nEJ' 



and is equal to the output EL 



