File:Skin depth by Zureks.png

Wikipedia open wikipedia design.

Original file(675 × 670 pixels, file size: 49 KB, MIME type: image/png)


English: Skin depth vs. frequency for various materials. The equation used for skin depth calculation was

where: δ - skin depth, ρ = resistivity of the material, ω = angular frequency = 2π × frequency, μ = absolute magnetic permeability (μr×μ0)

The materials are as follows:

  • Mn-Zn - soft ferrite 3C90 from Ferroxcube, initial permeability = 2300 (initial, 25 deg C, 10 kHz) and resistivity = 5 Ωm based on catalogue data [1], such ferrite is not a good conductor so the curve is shown here as dashed, just for demonstration how much better such materials are at higher frequencies
  • Al - aluminium, relative permeability = 1, resistivity = 2.7e-8 Ωm based on data from MatWeb [2]
  • Cu - copper, relative permeability = 1, resistivity = 1.7e-8 Ωm based on data from MatWeb [3]
  • steel 410 - magnetic stainless steel 410, permeability = 1000 and resistivity = 5.7e-7 Ωm based on data from MatWeb [4], the highest value of quoted permeability (1000) is used for "worst case" scenario
  • Fe-Si - grain oriented electrical steel (around 97% Fe and 3% Si) from AK Steel manufacturer, permeability = 29,000 and resistivity = 5e-7 Ωm based on manufacturer bulletin [5], maximum value of permeability is read out from the radial plot and it is used to demonstrate the "worst case" scenario
  • Fe-Ni - permalloy (trade name of VACUUMSCHMELZE GmbH & Co. KG is Mumetall), alloy mainly of Fe (around 20%) and Ni (around 80%), values of permeability = 250,000 [6] and resistivity = 5.5e-7 Ωm [7] are based on the manufacturer data.

Red vertical line indicates 50 Hz frequency.

Source Own work
Author Zureks


I, the copyright holder of this work, hereby publish it under the following license:
Creative Commons CC-Zero This file is made available under the Creative Commons CC0 1.0 Universal Public Domain Dedication.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.

File history

Click on a date/time to view the file as it appeared at that time.

current21:57, 24 February 2011Thumbnail for version as of 21:57, 24 February 2011675 × 670 (49 KB)Zureks{{Information |Description ={{en|1=Skin depth vs. frequency for various materials. The equation used for skin depth calculation was : <math>\delta=\sqrt{{2\rho }\over{\omega\mu}}</math> where: δ - skin depth, ρ = resistivity of the material, ω =
The following pages on the English Wikipedia link to this file (pages on other projects are not listed):

Global file usage

The following other wikis use this file:

This page is based on a Wikipedia article written by contributors (read/edit).
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.