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Differences between revisions 14 and 18 (spanning 4 versions)
⇤ ← Revision 14 as of 2018-07-17 07:09:40 →
Size: 1282
Editor: KeithLofstrom
Comment:
← Revision 18 as of 2018-07-17 07:39:56 → ⇥
Size: 1334
Editor: KeithLofstrom
Comment:
Deletions are marked like this. Additions are marked like this.
Line 6: Line 6:
|| Material || Temp || perm. || resis. ||<-7> depth (mm) at frequency       ||
|| || 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 || 13.4 || 1.7 || 0.67 || 0.43 || 0.19 || 0.95 || 0.030 ||
|| 3% Si Transformer Steel || 600 || 300? || 7e-7? || 24.3 || 3.1 || 1.2 || 0.77 || 0.34 || 0.17 || 0.054 ||
|| Copper || 300 || 1 || 1.7e-8 || 65.6 || 8.5 || 3.3 || 2.1 || 0.93 || 0.46 || 0.15 ||
|| Copper || 600 || 1 || 3.8e-8 || 98.1 || 13 || 4.9 || 3.1 || 1.4 || 0.69 || 0.22 ||
|| Aluminum || 300 || 1 || 2.8e-8 || 84.2 || 11 || 4.2 || 2.7 || 1.2 || 0.60 || 0.19 ||
|| Aluminum || 600 || 1 || 5.9e-8 || 122.2 || 16 || 6.1 || 3.9 || 1.7 || 0.86 || 0.27 ||		 || Material || Temp || perm. || resis. ||<-7> 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 ||
Line 16: Line 16:

[[ attachment:skindepth.ods | LibreOffice Spreadsheet]]

Skin Depth

=2r0  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

LibreOffice Spreadsheet

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