|
Size: 1108
Comment:
|
Size: 1130
Comment:
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| Deletions are marked like this. | Additions are marked like this. |
| Line 7: | Line 7: |
| || || K || $\mu_r$,,r,, || $\rho$ $\Omega$-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 || || || || || || || || |
|| || K || $\mu_r$||$\rho~~\Omega$-m || 60 Hz || 400 Hz || 1 KHz || 5 KHz || 20 KHz || 200 KHz || || 3% Si Transformer Steel || 300 || 700 || 5e-7 || || || || || || || || 3% Si Transformer Steel || 600 || 300? || 7e-7? || || || || || || || || Aluminum || 300 || 1 || 2.8e-8 || || || || || || || || Aluminum || 600 || 1 || || || || || || || || || Copper || 300 || 1 || 1.7e-8 || || || || || || || || Copper || 600 || 1 || 3.8e-8 || || || || || || || Resistivity - see Matula 1979 page 1161 |
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_r |
\rho~~\Omega-m |
60 Hz |
400 Hz |
1 KHz |
5 KHz |
20 KHz |
200 KHz |
3% Si Transformer Steel |
300 |
700 |
5e-7 |
|
|
|
|
|
|
3% Si Transformer Steel |
600 |
300? |
7e-7? |
|
|
|
|
|
|
Aluminum |
300 |
1 |
2.8e-8 |
|
|
|
|
|
|
Aluminum |
600 |
1 |
|
|
|
|
|
|
|
Copper |
300 |
1 |
1.7e-8 |
|
|
|
|
|
|
Copper |
600 |
1 |
3.8e-8 |
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|
|
|
|
|
Resistivity - see Matula 1979 page 1161