Theory and calculation of alternating current phenomena . 1040/1920 8 1170/1810 10/301450 Fig. 156. 314 ALTERNATING-CURRENT PHENOMENA In the diagrams, different points of £0 are marked with 1, 2,3 . ., when corresponding to leading current, with 2\ 3^. ., when corresponding to lagging current. EO-1000 P=9000540<Ei<;I< V5/ El eoX ^tx I 3/ 7 ^ ^. 540 620/820 720/1100 15/30 13 0 l^^^^^^^^ \ 900/ 1590 1 1 9 lOSO /17501200/16601440 13 15/30 Fig. 157. En=1000 P=12000 920<E,<1320 20<I<30. Fig. 158. The values of counter
Theory and calculation of alternating current phenomena . 1040/1920 8 1170/1810 10/301450 Fig. 156. 314 ALTERNATING-CURRENT PHENOMENA In the diagrams, different points of £0 are marked with 1, 2,3 . ., when corresponding to leading current, with 2\ 3^. ., when corresponding to lagging current. EO-1000 P=9000540<Ei<;I< V5/ El eoX ^tx I 3/ 7 ^ ^. 540 620/820 720/1100 15/30 13 0 l^^^^^^^^ \ 900/ 1590 1 1 9 lOSO /17501200/16601440 13 15/30 Fig. 157. En=1000 P=12000 920<E,<1320 20<I<30. Fig. 158. The values of counter , Ei, and of current, I, are notedon the diagrams, opposite to the corresponding points, £0. 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 , ei, 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 in the circuit (effective values). The mechanical power delivered by the synchro
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