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 242
rt-ing currentthrough the mo-tor armature,- This maximumcurrent value isusually specifiedin terms of thefull-load currentof the machine.Let 7 be the ratio of maximum starting current under loadto the full-load current ; this ratio is always greater thanunity. Let r^, r^, 7^3, . . . , r„ be the… … Fi3- 143. 7/ = n+r: (0 where E is the line voltage and R^ is the resistance of themotor armature. When the motor runs at constant speed MOTORS. 231 with this rheostat setting, the current flowing through thearmature is where Ec-^ is the counter E.M.F. generated at this speed.The rheostat arm may…
Electric machinery
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