Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 425
ield willthen have its maximumstrength and will be de-creased as the arm is movedto point 2, 3, etc. Increaswgthe field strength of a motordecreases its speed, while de-creasing the field strength in-creases the speed.^^ This isshown by the following ex-ample. Suppose a street car to be running on… … 1^ r= Fig. 377.—Speed Regulation of aSeries Motor. By Formula (103) C E-g_500 —400 = 100 amperes. r 1 The power developed by the motor will be, Bv Formula (105) AV= ig X C = 400 X 100 = 40000 watts (53.6H. P.). Suppose it is desired to run the car more slowly. Increasethe field strength, say 10 per…
Electricity · Magnetism
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