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 322
ent. As there is no iron inthe magnetic circuit and since the speed of rotation is low,little or no counter E.M.F. will be induced in the armaturecoil; thus the armature current is independent of the speed,and is directly proportional to the line voltage. For thesame reason the field flux is… … Fig. 203. CENTRAL-STATION EQUIPMENT. 311 speed of rotation proportional to the torque. This is accom-plished by applying a magnetic drag, in the form of analuminum disk fastened to the armature spindle and passingbetween the poles of permanent magnets. The electromo-tive forces induced in the disk…
Electric machinery
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