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# Re: [femm] BH data

- To: femm@yahoogroups.com
- Subject: Re: [femm] BH data
- From: Keith Gregory <k.gregory@lboro.ac.uk>
- Date: Wed, 23 Oct 2002 08:06:48 +0100
- In-reply-to: <E01C2364780AB84CA32750019869A48D12C1FC@exchange.solartronm etrology.com>

`Michael,`
`Could I ask what you mean by low frequency?`
`Keith.`
`At 15:30 21/10/2002 +0100, you wrote:`

> `Hi David (Meeker) and others,`
> `I am trying to include Radiometal in the materials library. I have the manufacturers data for d.c. induction but it is in the form of an initial magnetisation curve. This is unlike the mumetal and supermalloy materials in the femm library, which show a high initial slope / permeability, declining steadily as saturation is approached. These plots ignore hysteresis.`
> `I am tempted to input data from the radiometal d.c. hysteresis loops which I also have, shifted to pass through the origin. At least then the plot shape is correct. Is this likely to give acceptable results for modelling of low frequency fields and inductances?`
> `Perhaps the included BH curves are similarly derived. I feel it will be better to do this than use a description with an initially increasing permeability with H.`
> `BTW thank you for an excellent free tool, and all the inputs to an interesting discussion group.`

>     Michael J Hutchings
>     Engineer
>     Solartron Metrology

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    Dr. Keith Gregory
    Senior Lecturer
    Department of Electronic & Electrical Engineering
    Loughborough University
    Loughborough
    Leicestershire
    LE11 3TU
    UK

    Phone: +44 (0) 1509 227025 Fax: +44 (0) 1509 227014
    Department web: http://www.lboro.ac.uk/departments/el/

    --=====================_373897==_.ALT
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`<html>
Michael,<br><br>
Could I ask what you mean by low frequency? <br><br>
Keith.<br><br>
At 15:30 21/10/2002 +0100, you wrote:<br><br>
<blockquote type=cite class=cite cite><font face="Arial, Helvetica" size=2>Hi
David (Meeker) and others,</font> <br><br>
<font face="Arial, Helvetica" size=2>I am trying to include Radiometal in
the materials library. I have the manufacturers data for d.c. induction
but it is in the form of an initial magnetisation curve. This is unlike
the mumetal and supermalloy materials in the femm library, which show a
high initial slope / permeability, declining steadily as saturation is
approached. These plots ignore hysteresis.<br>
</font><br>
<font face="Arial, Helvetica" size=2>I am tempted to input data from the
radiometal d.c. hysteresis loops which I also have, shifted to pass
through the origin. At least then the plot shape is correct. Is this
likely to give acceptable results for modelling of low frequency fields
and inductances?<br>
</font><br>
<font face="Arial, Helvetica" size=2>Perhaps the included BH curves are
similarly derived. I feel it will be better to do this than use a
description with an initially increasing permeability with H.<br>
</font><br>
<font face="Arial, Helvetica" size=2>BTW thank you for an excellent free
tool, and all the inputs to an interesting discussion group.</font>
<br><br>
<font face="Arial, Helvetica" size=2>Michael J Hutchings</font> <br>
<font face="Arial, Helvetica" size=2>Engineer</font> <br>
<font face="Arial, Helvetica" size=2>Solartron Metrology</font> <br><br>
<br>
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material. Any review, retransmission, dissemination or other use of, or<br>
taking of any action in reliance upon, this information by persons or<br>
entities other than the intended recipient is prohibited. If you<br>
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************************************************************************<br><br>
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<x-sigsep><p></x-sigsep>
Dr. Keith Gregory<br>
Senior Lecturer<br>
Department of Electronic &amp; Electrical Engineering<br>
Loughborough University<br>
Loughborough<br>
Leicestershire<br>
LE11 3TU<br>
UK<br><br>
Phone: +44 (0) 1509 227025&nbsp; Fax: +44 (0) 1509 227014<br>
Department web: <a href="http://www.lboro.ac.uk/departments/el/"; eudora="autourl">http://www.lboro.ac.uk/departments/el/<br><br>
</a></html>`
`--=====================_373897==_.ALT--`

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