Thomälen, Adolf, 1865-, Thomälen Adolf. Kurzes Lehrbuch der Electrotechnik. English · London, E. Arnold · leaf 239
* lines.If we neglect the small ohmic pressure drop, the speed is inversely propor-tional to the flux. In the present case, therefore, the speed has been in-creased in the ratio of 3-1 to 2-5, or 24 per cent., by putting an equivalentresistance in parallel with the field winding. This method of… … Fig. 208 Fig. 209 all connected in series at starting. At full speed they are connected inparallel, so that each magnet coil carries only a part of the armature current.The speed can be economically varied over a considerable range by thismethod. Two steps in such an arrangement are shown in Figs.…
Electrical engineering
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