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), 1833-1928 · New York : T. Audel & Co. · leaf 203
.d magnets? Ans. Commercial voltages are obtained at moderate arma-ture speed. CLASSES OF DYNAMO 183 The difficulty experienced with bipolar machines is that, with adynamo of large output, the speed at which its armature would haveto rotate to generate commercial voltages would be excessive. It is… … 0_uT>5ipE c i rcuTt CIRCUIT Figs 188 and 189.—Circuit diagrams to illustrate the difference between a dynamo and amagneto. The former has its field magnets F F magnetized by means of a small currentflowing around a shunt circuit. In a magneto the field magnets are permanently magnet-ized. The…
Electrical engineering
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