Theory and calculation of alternating current phenomena . 340 430 / 630 10 / 30 750/1090 8 900/1720 7/43 1040/1920 8 1170/1810 10/301450 Fig. 156. 314 ALTERNATING-CURRENT PHENOMENA In the diagrams, different points of Eq are marked with 1, 2,3 . ., when corresponding to leading current, with 2^, 3^. ., when corresponding to lagging current. 1y Eo=1000P=9000 7 540<E:i<1750 , / ;I< e/ ey^ ~~~/\ El I / J \ 4 540 / 7 ^V^^ 620/820 15/30 1 720/1100 13 1 / /ii^^^^^^^^^^^l 0 l^^^^^^ 1 900/1590 ^^^r--^ / \ ^^^^^^r^^^^ 1080/1750 13 \ /* 12
Theory and calculation of alternating current phenomena . 340 430 / 630 10 / 30 750/1090 8 900/1720 7/43 1040/1920 8 1170/1810 10/301450 Fig. 156. 314 ALTERNATING-CURRENT PHENOMENA In the diagrams, different points of Eq are marked with 1, 2,3 . ., when corresponding to leading current, with 2^, 3^. ., when corresponding to lagging current. 1y Eo=1000P=9000 7 540<E:i<1750 , / ;I< e/ ey^ ~~~/\ El I / J \ 4 540 / 7 ^V^^ 620/820 15/30 1 720/1100 13 1 / /ii^^^^^^^^^^^l 0 l^^^^^^ 1 900/1590 ^^^r--^ / \ ^^^^^^r^^^^ 1080/1750 13 \ /* 1200 /1660 15/30 v_ 1440 Fig. 157. En=1000 P=12000 920<E,<1320 20<I<30. El ^3 920412 920/11005l, 1000/1260 1120/132012S0 I 21 / 28.( 20/30 2l/28.( Fig. 158. The values of counter , E\, and of current, /, are notedon the diagrams, opposite to the corresponding points, E^. SYNCHRONOUS MOTOR 315 In this condition it is interesting to plot the current as functionof the generated , Ei, of the motor, for constant power, curves are given in Fig. 162 and explained in the followingon page 430. 219. While the graphic method is very convenient to get aclear insight into the interdependence of the different quantities,for numerical calculation it is preferable to express the diagramsanalytically. For this purpose, Let z = -y/r^ + x^ = impedance of the circuit of (equivalent)resistance, r, and (equivalent) reactance, x = 2 irfL, containingthe impressed , eo and the counter , d, of the syn-chronous motor^; that is, the generated in the motor arma-ture by its rotation through the (resultant) magnetic field. Let i = current
Size: 1512px × 1652px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectelectriccurrentsalte
