Dynamos and motors; a text book for colleges and technical schools (1911)
Franklin, William S. (William Suddards), 1863-1930, Esty, William, 1868-1928 · New York The Macmillan company · leaf 290
g that cos {BI)=^—I. 2. When the electromotive force B of the synchronous motor is adjustable, maxi-mum efficiency is obtained when the current (and also A/) is a minimum ; valuesof A, X, R and F^ being given. This minimum current is obtained when B isadjusted until A and / are in phase with each… … represents the value of the electromotive force of machine A, and E represents theresultant electromotive force of machines A and B. From this figure we have {A— Piy + X-^Pr^B^ from which B may be calculated when / is known. The value of / may be cal-culated from the relation AI cos [A I) =^ P -f…
Dynamos · Electric motors
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