Lessons in practical electricity; principles, experiments, and arithmetical problems; over four hundred illustrations; an elementary text book (1909)
Swoope, C. Walton (Coates Walton), d. 1901 · New York, D. Van Nostrand company · leaf 425
t by moving armS to the right, and the speed increases and a greater portionof the energy is available for useful work. This is not aneconomical method of regulating the speed of a motor, sincethe energy taken from the line (5 K. W.) is the same whetherthe motor be running at a very slow speed or… … i\ r= Fig. 377.—Speed Regulation of aScries Motor. 366. Speed Regulation of Series Motors— Secom.Method—The method of regulating the speed of a Bene*wound motor, by increasing or decreasing its field strengthby varying the turns around the field, is illustrated in Fig. 377. The current throughthe…
Electricity · Magnetism
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