. A text-book of electrical engineering;. ^ is neutralised, however, by the armature ampere-turns, leaving Xg to overcome thereluctance. It is analogous to charging an accumulator. 322 Electrical Engineering exceed this resultant DB by an amount equal to the demagnetising ampere-turns Xg^. This, however, does not concern us at present, as one wouldnaturally subtract X^ from X^, and obtain the resultant DB before referringto the characteristic. Turning now to the useful flux, we see that, since thecurve near the origin is practically the magnetisation curve for the air-gaponly, OD will represen
. A text-book of electrical engineering;. ^ is neutralised, however, by the armature ampere-turns, leaving Xg to overcome thereluctance. It is analogous to charging an accumulator. 322 Electrical Engineering exceed this resultant DB by an amount equal to the demagnetising ampere-turns Xg^. This, however, does not concern us at present, as one wouldnaturally subtract X^ from X^, and obtain the resultant DB before referringto the characteristic. Turning now to the useful flux, we see that, since thecurve near the origin is practically the magnetisation curve for the air-gaponly, OD will represent the decrease of flux crossing the gap owing to thedecrease OD = Xg^ — Xg in the air-gap ampere-turns. Hence the usefulflux is reduced from AB to AF, if we take 0 as the origin, the curve representsthe relation between the resultant ampere-turns and the useful flux. We must now determine the position of the point 0. To do this wesubstitute in equation (156) the values given in the table, and obtain R -^(70 ~-^a = -^d- R + Rl •(157)-.
Size: 1615px × 1547px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, bookidcu3192400440, bookyear1920
