VOLTAGE RATIO IN SYNCHRONOUS CONVERTERS 229 



The final ratio of the per cent wth harmonic in the phase E.M.F. 

 to the per cent mih harmonic in the flux distribution curve is 



== Rrm X Kjm X Kgm ~ 



. wx- mi: x 



sin Ac sin sin 



X X - /(.Ksm. . (o) 



. 1C- . X . WX 



sm -Ac sin . sin T 

 ' 



It remains to consider the phases of the harmonics in the resultant 

 E.M.F. 



2X 



The total phase rotation of the fundamental is , and the phase 



.80 .82 .84 .86 .88 .90 



Coil Pitch in Terms of Full Pitch 



FlG. 30. 



.92 



.96 



1.0 



of the fundamental of the resultant E.M.F. with respect to the 

 fundamental of slot No. i is 



x x 



The total phase rotation of the mih harmonic is f-. 



P 



VYl 



Let w= nearest whole number less than and w s = nearest whole 



P 



number less than ^- Then the equivalent phase rotation of the 



21\ sp 



