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 183
appearance of the flux in the fields isliable to reach such a magnitude as to pierce the insulationof the field coils and destroy their usefulness. To obviatethis, before the field circuit is broken, the field coils areconnected (Fig. 99) through a high discharge resistance,and the current in them… … Field Switch Parallel Resistance f^heostat Switch DischargeResistance Pilot Lamp Oo= rield jHrmatur-e Fig. 99. 78. Self-Regulation. — By far the most elegant methodof constant potential regulation is that in which the maincurrent of the machine is utilized in maintaining constantthe magnetic flux…
Electric machinery
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