Skin Depth
\delta = \sqrt{ 2 \rho / \omega \mu_r \mu_0 } , 2 / \mu_0 = 1.59e6 m/H
Material |
Temp |
perm. |
resis. |
depth (m) at frequency |
|||||
|
K |
\mu_rr |
\rho \Omega-m |
60 Hz |
400 Hz |
1 KHz |
5 KHz |
20 KHz |
200 KHz |
3% Si Transformer Steel |
300 |
700 |
|
|
|
|
|
|
|
3% Si Transformer Steel |
700 |
700? |
|
|
|
|
|
|
|
Aluminum |
300 |
1 |
|
|
|
|
|
|
|
Aluminum |
700 |
1 |
|
|
|
|
|
|
|
Copper |
300 |
1 |
|
|
|
|
|
|
|
Copper |
700 |
1 |
|
|
|
|
|
|
|