Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 196
cies; therefore, in the commercial machines, theexcitation frequency is reduced to the minimum value possible; fromtwo to five cycles per second being suitable for convenient employment. These machines as heretofore constructed are not self-exciting, butas the principle of image current enables the… … EXCITER Pig. 1446.—Diagram of constant pressure image current alternator connections. The imageor reproduced currents are characteristic of all types of asynchronous machines, and irecalled image currents because they are actually the reflection from the load curreirliverad by the armature circuit.…
Electrical engineering
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