Differences between revisions 25 and 26
 ⇤ ← Revision 25 as of 2018-07-18 17:25:11 → Size: 1607 Editor: KeithLofstrom Comment: ← Revision 26 as of 2018-07-18 17:29:34 → ⇥ Size: 1655 Editor: KeithLofstrom Comment: Deletions are marked like this. Additions are marked like this. Line 14: Line 14: || Graph by [[ https://commons.wikimedia.org/wiki/User:Zureks | Zureks]]<
>from Wikipedia<
>article [[ https://en.wikipedia.org/wiki/Skin_effect | skin effect ]]||<-10> {{ https://upload.wikimedia.org/wikipedia/commons/f/f3/Skin_depth_by_Zureks.png }} ||Resistivity - for copper see Matula 1979 page 1161, for aluminum see Simmons 1960[[ attachment:skindepth.ods | LibreOffice Spreadsheet]] || '''Resistivity'''<
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> for copper see <
> Matula 1979 page 1161<
>for aluminum see Simmons 1960 ||<-10> {{ https://upload.wikimedia.org/wikipedia/commons/f/f3/Skin_depth_by_Zureks.png }} |||| Graph by [[https://commons.wikimedia.org/wiki/User:Zureks | Zureks]]<
>from Wikipedia<
>article [[ https://en.wikipedia.org/wiki/Skin_effect | skin effect ]] |||| [[ attachment:skindepth.ods | LibreOffice Spreadsheet]] ||

# Skin Depth

\delta = \sqrt{ 2 \rho / \omega \mu_r \mu_0 } in m ~=~ \sqrt{ 2.533e11 \rho / f \mu_r } ~~ in mm ~~~~~~ 2 / 2 \pi \mu_0 = 253303 m/H

 Material Temp perm. resis. depth (mm) at frequency (Hz) K \mu_r \rho~~\Omega-m 1 Hz 60 Hz 400 Hz 1 KHz 5 KHz 20 KHz 200 KHz 3% Si Transformer Steel 300 700 5e-7 13 1.7 0.67 0.43 0.19 0.95 0.030 3% Si Transformer Steel 600 300? 7e-7? 24 3.1 1.2 0.77 0.34 0.17 0.054 Copper 300 1 1.7e-8 66 8.5 3.3 2.1 0.93 0.46 0.15 Copper 600 1 3.8e-8 98 13 4.9 3.1 1.4 0.69 0.22 Aluminum 300 1 2.8e-8 84 11 4.2 2.7 1.2 0.60 0.19 Aluminum 600 1 5.9e-8 122 16 6.1 3.9 1.7 0.86 0.27 Resistivity for copper see Matula 1979 page 1161 for aluminum see Simmons 1960 Graph by Zureks from Wikipedia article skin effect

SkinDepth (last edited 2018-07-18 17:58:39 by KeithLofstrom)