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 297
is zero, and the battery neither charges nor dis-charges. With heavy load E^ > E, Eb is added to E^, andthe battery discharges. With light load, E^<E, Eb is re-versed and is opposed to E^, and the battery charges.This system is sometimes called the counter E.M.F. systembecause the exciter… … Fig. 186. connections are as indicated in Fig. 186. Two piles ofcarbon plates / and r have variable resistances, which arereduced under pressure, and whose magnitudes are con-trolled by the combined action of the solenoid 5 and thespring s. The resistance Ri is reduced and R^ increasedupon increase…
Electric machinery
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