Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 385
force between the bars, which must now be considered asnegative, will grow from zero to the value E. (4) While the armature is making the fourth quarter of arevolution from the A position, the bars will move until they areagain midway between the direct-current brushes; and the electro-motive force… … Fig. 297. E.M.F. Curve for One Revolution of D. C. Dynamo These successive changes of electromotive force, between thegiven pair a b of commutator bars, which occur during one com-plete revolution of the armature, are shown graphically in Fig. 297. It is at once evident that the electromotive force…
Electrical engineering
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