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MAGNETIC_PERMEABILITY.html
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MAGNETIC_PERMEABILITY.html
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<html><head><link rel="stylesheet" type="text/css" href="style.css"/></head><body> <H2> <BR> *MAGNETIC PERMEABILITY </H2> <P> Keyword type: model definition, material <P> This option is used to define the magnetic permeability of a material. There are no parameters. The material is supposed to be isotropic. The constant may be temperature dependent. The unit of the magnetic permeability coefficient is the unit of force divided by the square of the unit of electrical current. In SI-units this is N/A<SPAN CLASS="MATH"><B><IMG WIDTH="11" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" SRC="img3.png" ALT="$ ^2$"></B></SPAN> or Henry/m. The magnetic permeability may be viewed as the product of the relative magnetic permeability (dimensionless) <SPAN CLASS="MATH"><B><IMG WIDTH="20" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" SRC="img2325.png" ALT="$ \mu_r$"></B></SPAN> with the permeability of vacuum <SPAN CLASS="MATH"><B><IMG WIDTH="20" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" SRC="img2326.png" ALT="$ \mu_0$"></B></SPAN>. <P> Following the magnetic permeability constant the user is supposed to define the domain for which this material is used. In an electromagnetic calculation there are three domains: <P> <OL> <LI>the air, which is the P-domain (domain 1) </LI> <LI>the bodies, which is the A,V-domain (domain 2) </LI> <LI>that part of the air, which, if filled with body material, ensures that the bodies are simply connected; this is the A-domain (domain 3). If there is only one body and if it is such that it is naturally simply connected the A-domain is empty. </LI> </OL> <P> For more details the reader is referred to the section on electromagnetism. <P> <P><P> <BR> <P> First line: <UL> <LI>*MAGNETIC PERMEABILITY </LI> </UL> <P> Following line: <UL> <LI><SPAN CLASS="MATH"><B><IMG WIDTH="13" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" SRC="img48.png" ALT="$ \mu$"></B></SPAN>. </LI> <LI>number of the domain </LI> <LI>Temperature. </LI> </UL> Repeat this line if needed to define complete temperature dependence. <P> <PRE>
Example:
*MAGNETIC PERMEABILITY
1.255987E-6,2
</PRE> <P> tells you that the magnetic permeability coefficient is 1.255987 <SPAN CLASS="MATH"><B><IMG WIDTH="16" HEIGHT="29" ALIGN="MIDDLE" BORDER="0" SRC="img13.png" ALT="$ \times$"></B></SPAN> 10<SPAN CLASS="MATH"><B><IMG WIDTH="21" HEIGHT="18" ALIGN="BOTTOM" BORDER="0" SRC="img2327.png" ALT="$ ^{-6}$"></B></SPAN>, independent of temperature (if SI-units are used this is the magnetic permeability of copper). The domain for which this material is defined is the A,V-domain. <P> <P><P> <BR> Example files: induction. <P> </body></html>