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 169
e auxiliary apparatus should notbe charged to the machine, but to the plant consisting ofmachine and auxiliary apparatus taken together. In suchcases plant efficiency should be distinguished from machineefficiency. The efficiency of a dynamo increases with the size, beinglow on small machines, and… … 200 300 K.W. OUTPUT Fig. 90. 100 ____ — ^ e / ( y / / y / Pe + \ / P/-a. .^ ^^ ^ ^0*^^ ^ 1/. X l^ >-^ ^^ ^ fp -.— i^ ^j^ Pc ^ PERCENTAGE OUTPUT Fig. 91. The efficiency of a compound- or shunt-wound dynamois small at low outputs because the practically constantcore losses, friction and windage…
Electric machinery
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