Practical electricity .. with questions and answers (1911)
Cleveland armature works, [from old catalog] comp, Lincoln, John C. [from old catalog] · [Cleveland, Ohio, Cleveland armature works] · leaf 144
armature assubjected will not affect it. In practice the discs for arma-tures run from ten to twenty-five thousandths of an inch inthickness. Even in the thinnest disc there are small eddycurrents circulating which take power to produce and whichheat ihe armature core. The loss by eddy currents… … Figure 51 Circulation of eddy currents stopped by lamination of the iroxi. 134 Formula 8 shows that the loss in watts with doublevolts and double current is four times as great as with thegiven voltage. It is because of the loss by eddy currentsthat would occur with solid pole pieces that pole…
Electricity
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