Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 225
alue of O or of /„, for which the speed at a given loadis a maximum. We can find this critical value of /„ from equation (103) onpage 202, in which we equated the mechanical and the electrical power.We have then ^ j^ ^ y j^ _ j^2_r^ = M,.277.«.9-81. As one of the conditions of our experiment is… … ^ Fig. 192 The maximum value of the speed is therefore reached when the field isso far weakened that the pressure drop in the armature is equal to a half ofthe terminal pressure. The electrical efficiency of the armature would thenbe 50 per cent., but the conditions, if for no other reason than the…
Electrical engineering
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