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# BH data

- To: "Femm \(E-mail\)" <femm@yahoogroups.com>
- Subject: BH data
- From: "HUTCHINGS Michael" <mhutchings@solartronmetrology.com>
- Date: Mon, 21 Oct 2002 15:30:30 +0100
- Importance: normal
- Priority: normal
- Thread-index: AcJ5DmcdVdADs/GNR0m17k+qqPe7Xw==
- Thread-topic: BH data

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 mumetaland 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 withan 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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