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# Re: [femm] GO Material

- To: femm@egroups.com
- Subject: Re: [femm] GO Material
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Fri, 26 May 2000 09:53:44 -0400
- Organization: Foster-Miller, Inc.
- References: <e8.4d50c38.265dd3b4@aol.com>

    fnent@aol.com wrote:

    > I tried assigning the x-y permeabilities but
    > the answer was not affected as much as it should have been as your answer
    > suggests.

    One trick is that anisotropic permeabilities only work if you have not checked
    the "Nonlinear B-H Curve" checkbox in the material properties dialog. Failing
    that, the program ought to give you something reasonable. It may that in the
    geometry that you were considering, the anisotropic permeability just didn't make
    that much of a difference. This can happen especially with magnetic circuits
    with air gaps. In this case, the reluctance of the air is so high relative to
    any iron parts that the geometry of the air gaps almost entirely dictate the flux
    distribution. It doesn't make much of a difference whether or not the iron in
    the circuit is anisotropic, as long as it still has a relative permeability a lot
    higher than 1 in all directions. However, if you make a magnetic circuit in which
    the flux passes only through the anisotropic material (and there is a substantial
    anisotropy), you will see an obvious qualitative difference in the results.

    Dave.

    begin:vcard
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    tel;work:781-684-4070
    x-mozilla-html:TRUE
    url:http://members.aol.com/dcm3c
    org:Foster-Miller, Inc.;Electrical and Electronic Systems Group
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    email;internet:dmeeker@foster-miller.com
    title:Senior Engineer
    adr;quoted-printable:;;350 Second Avenue=0D=0A;Waltham;MA;02451-1196;USA
    fn:David Meeker, Ph.D.
    end:vcard

- References:
  - Re: [femm] GO Material
    - From: fnent@aol.com

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