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 265
253 and the other through the resistance to ground. If theresistance be properly proportioned no current will passthrough switch C, and this may be opened, thus placingboth motors with resistance directly across the line.Switches 2 to 7 are then closed progressively as before,after which the motors… … Fig. 162. When four motors are installed on a car, they mayfirst be connected in series, then each pair in parallelwith the two groups in series, and finally all connected inparallel; this is known as the series, series-parallel, parallelmethod. The manipulation of the various switches may be…
Electric machinery
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