CONVERTERS 381 



current is ^ and the effective value of the alternating current is 



V2I 





r = 



n sin- 

 n 



The instantaneous value of the alternating current is 



i = \/2 7 sin = 



27 



. 7T 



sm- 

 n 



sn 



. . . . (354) 



and the instantaneous value of the resultant current is 



27 7 



o 



(355) 



n sm- 



In an armature coil d displaced by angle from the centre of 

 the phase the alternating current is 



i = V2 F sin(0 -ft (356) 



and the instantaneous value of the resultant current is 



. 7T 



n sm- 

 n . 



I ( 4 sin (0 -ft 



sm- 

 n 



The effective value of the resultant current is 



4 sin (0-0) 



. 7T 



n sm- 



- 1 



- AT 



9JwJ. 



(357) 



(358) 



8jl -cos2(0-ftj _ 8 sm(0 - ft ] 



^~77" . 7T L U 



n 2 sin 2 - n sin - 



n n 



