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# Metglas square loop BH curves

- To: femm@egroups.com
- Subject: Metglas square loop BH curves
- From: Dave Squires <djsquires@plix.com>
- Date: Sun, 19 Nov 2000 09:27:17 -0800
- References: <39F5CEB6.BD6DC152@foster-miller.com>

    David,
    I just wondered if FEMM is able to handle reliably square loop low
    hysteresis
    materials with relative permeabilities from 400,000 to 1,000,000?
    I did put in a curve of Metglas 2605SA1 material and it seems mostly OK
    showing saturation about where it is supposed to. I just wondered if there
    anything I should watch out for where FEMM might break down with these
    types of curves.

    I did notice that the plotting feature allows me to identify bad data
    points.
    It seems you must be using a cubic spline interpolation function or at
    least a polynomial one. I noticed that bad data points cause it to give the
    sinx/x type ringing behavior when it blows up the curve.

    Sometimes I see FEMM appear to hang in solving if the mesh size is too
    small.
    I double the mesh size and the solution is done in a few seconds.
    Just to let you know.

    Regards,
    Dave Squires

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- References:
  - Updated femm30 beta
    - From: David Meeker <dmeeker@foster-miller.com>

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