Theory and calculation of alternating current phenomena . e=*iie— -i. Fig. 159. Fig. 160. This equation shows that, at given impressed , eo, andgiven, impedance, z = \^r^ -\- x^, three variables are left, ei, i, p,of which two are independent. Hence, at given eo and z, thecurrent, ^, is not determined by the load, p, only, but also by theexcitation, and thus the same current, i, can represent widelydifferent loads, p, according to the excitation; and with the sameload, the current, i, can be varied in a wide range, by varying thefield-excitation, ei. The meaning of equation (7) is made m
Theory and calculation of alternating current phenomena . e=*iie— -i. Fig. 159. Fig. 160. This equation shows that, at given impressed , eo, andgiven, impedance, z = \^r^ -\- x^, three variables are left, ei, i, p,of which two are independent. Hence, at given eo and z, thecurrent, ^, is not determined by the load, p, only, but also by theexcitation, and thus the same current, i, can represent widelydifferent loads, p, according to the excitation; and with the sameload, the current, i, can be varied in a wide range, by varying thefield-excitation, ei. The meaning of equation (7) is made more perspicuous bysome transformations, which separate ei and i, as function of pand of an angular parameter, 0. Substituting in (7) the new coordinates; /9 = et^ — z~P or. ei zH^ = vi . (8) SYNCHRONOUS MOTOR we get Co - a\/2-2rp = 2 r 13 z \ 2substituting again, en = a 2 zp = br = ez,hence, x = z\/l — e- 2 rp = th,we get — z^p^ a - aV2 - eb = V(l -e2)(2Q:2_2,32-62);and, squared, 2 2 . /1 2^«2 /o^ ^, , b^{l - 6^) (ff - 66)^ e^a^ + (1 - e2)/32 - aV2(a - e6) H
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectriccurrentsalte
