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Re: [femm] BH data

To: femm@xxxxxxxxxxxxxxx
Subject: Re: [femm] BH data
From: Keith Gregory <k.gregory@xxxxxxxxxxx>
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/


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<html> Michael, Could I ask what you mean by low frequency? Keith. At 15:30 21/10/2002 +0100, you wrote: <blockquote type=cite class=cite cite>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 ************************************************************************ The information transmitted is intended only for the person or entity to which it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of, or taking of any action in reliance upon, this information by persons or entities other than the intended recipient is prohibited. If you received this in error, please contact the sender and delete the material from any computer. ************************************************************************ Yahoo! Groups Sponsor ADVERTISEMENT <a href="http://rd.yahoo.com/M=229441.2397090.3822005.2273195/D=egroupweb/S=1705083663:HM/A=1274502/R=0/*http://www.bmgmusic.com/acq/ee/q6/enroll/mhn/10/";><img src="cid:5.1.0.14.0.20021023080512.00abc6a0@xxxxxxxxxxxxxxxxxxxxxxxxxx"; width=300 height=250 alt="5a2a9.jpg"></a> <img src="cid:5.1.0.14.0.20021023080512.00abc6a0@xxxxxxxxxxxxxxxxxxxxxxxxxx"; width=1 height=1 alt="5a30d.jpg"> <tt>Your use of Yahoo! Groups is subject to the <a href="http://docs.yahoo.com/info/terms/";>Yahoo! Terms of Service</a>.</tt> </blockquote> <x-sigsep></x-sigsep> 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: <a href="http://www.lboro.ac.uk/departments/el/"; eudora="autourl">http://www.lboro.ac.uk/departments/el/ </a></html>

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