. The Bell System technical journal . ), where highinductance is desired, and a-c. losses are naturally low. ~^ —• --^ ^ \ \ Mo Lo \ \ \\\ \ \\\\ / / N . / / / \\ / / \ \ /Re \\ / (jOLq / \ / \ s. / \ y 1 / \ s. e2 1 \ e 3 e 7 8 9 10 Fig. 7—Effect of eddy current shielding on apparent permeability and on eddycurrent resistance/reactance ratio of sheet core material. Coils designed for direct currents must have cores with high in the presence of superposed field, they must bemade of high p
. The Bell System technical journal . ), where highinductance is desired, and a-c. losses are naturally low. ~^ —• --^ ^ \ \ Mo Lo \ \ \\\ \ \\\\ / / N . / / / \\ / / \ \ /Re \\ / (jOLq / \ / \ s. / \ y 1 / \ s. e2 1 \ e 3 e 7 8 9 10 Fig. 7—Effect of eddy current shielding on apparent permeability and on eddycurrent resistance/reactance ratio of sheet core material. Coils designed for direct currents must have cores with high in the presence of superposed field, they must bemade of high permeability magnetic materials having high saturationvalues. Reference to Fig. 5 shows permendur outstanding in thisregard. In practice, the low costs of silicon iron or magnetic iron are 458 BELL SYSTEM TECHNICAL JOURNAL frequently decisive in the selection of these materials instead of thetechnically superior materials noted above. Air-gaps are often foundnecessary to reduce the superposed field strength in the magnetic
Size: 1698px × 1472px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
