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# Skin Depth

 Material Absolute Temperature relative permeability resistivity skin 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 { \Large { \delta = \sqrt{ 2 \rho \over { \omega ~ \mu_r ~ \mu_0 } } } } in meters { \Large { \delta = \sqrt{ 2.533e11 \rho \over { f ~\mu_r } } } } in mm { \LARGE { { 2 \over { 2 \pi \mu_0 } } } } = 253303 m/H Permeability WAG, need citation 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)