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 231
piece. How-ever, when a dynamo, with horned pole pieces, has been running for some time as a motorthe forward horns are cool and the hincjwarcl ferns hot. FIELD MAGNETS 211 currents occurring when a solid metallic mass is rotated in amagnetic field. These currents consume a large amount ofenergy… … Fig. 234.—Fort Wayne laminated pole piece before being cast welded into frame. In the faces ofsolid pole pieces there exist minute electric currents called eddy currents which cause heatingof the iron and increase the energy required to maintain a magnetic circuit in much the samemanner as does…
Electrical engineering
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