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 228
f cross sections, all of the same area.The number marked on each section indicates the length of the boundaryline, that of the circle being taken for convenience as 100. Ques. What are the pole pieces? Ans. These are the end portions of the field magnets, joinedto, or cast together with the core… … Fig. 226.—Unsymmetrical pole piece introduced by Gravierto concentrate the magnetic field.When the dynamo is working at small loads, the flux in the gap is nearly uniform, butat heavy loads, the distortion due to the armature current forces the flux forward andsaturates the forward horn, thus…
Electrical engineering
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