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 139
cy of com-mutation is much higher for multiplex windings than forsimplex windings. COMMUTATION. 127 Let + /j be the current flowing in a coil just enteringunder a brush. After the time 4, the current value in thatcoil for perfect commutation should be —/^. What the in-stantaneous values of the… … Fig. 78. Fig. 79. coil undergoing commutation. It represents a sinusoidalcurrent change. Numerous curves, such as Fig. 79, havebeen obtained showing the actual current variation duringthe period of short-circuit based upon experimental obser-vations, but such curves differ widely among…
Electric machinery
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