Differences between revisions 30 and 31
 ⇤ ← Revision 30 as of 2018-07-18 17:38:31 → Size: 1708 Editor: KeithLofstrom Comment: ← Revision 31 as of 2018-07-18 17:38:47 → ⇥ Size: 1706 Editor: KeithLofstrom Comment: Deletions are marked like this. Additions are marked like this. Line 12: Line 12: ||$\delta = \sqrt{ 2 \rho / \omega \mu_r \mu_0 }$ in meters <
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>$\delta = \sqrt{ 2.533e11 \rho / f \mu_r } ~~$ in mm<
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>$2 / 2 \pi \mu_0$ = 253303 m/H || ||$\delta = \sqrt{ 2 \rho / \omega \mu_r \mu_0 }$ in meters <
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>$\delta = \sqrt{ 2.533e11 \rho / f \mu_r }$ in mm<
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>$2 / 2 \pi \mu_0$ = 253303 m/H ||

# Skin Depth

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