Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 95
ration Curve.—The voltagegenerated in the armature of a direct-current machine, beingproportional to the rate of cutting lines of force, is proportional tothe speed and to the flux per pole or E = a const. X 4> X r.p.m. for a given machine. The flux per pole, and therefore the voltage, increase… … O a Exciting Current If Fig. 95.—Magnetization curve of a direct current generator. a curve is shown in Fig. 95. With no excitation there is a voltageer due to residual magnetism; as the exciting current is increased,the flux per pole and the voltage increase in the same ratio until,with an…
Electrical engineering
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