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 208
ariable resistance in shunt with the field coils ; and as thefield current is changed the position of the brushes is alsochanged, not to collect current at a lower voltage, as de- 196 DYNAMO ELECTRIC MACHINERY. scribed in §85, but to obtain sparkless collection. Thesetwo operations are performed by… … Fig. 118. type, and a rotary piston in a short cylinder, which isdirectly connected to an arm moving over the contacts ofthe field-shunt rheostat. The valve is operated by a leveractuated by a controlling electro-magnet which is energizedby the whole generator current. At normal current thevalve is…
Electric machinery
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