Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 214
he segments of a three-bar commutator, from which thecurrent is collected by four copper brushes connected inmultiple. Regulation is obtained by shifting the brushes in thefollowing manner. Fig. 123 shows the two possible rela-tions between brushes and commutator that may exist atany instant. Both… … Fig. 123. the dotted line shows the position where the maximumE.M.F. is generated in the coils, then in Fig. 123 (2 the twomost active coils are connected in series with the outsidecircuit, while the coil near the position of least activity isout of circuit. In Fig. 123 <^ the two less active…
Electric machinery
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