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# Re: [femm] Superconductor model

- To: femm@yahoogroups.com
- Subject: Re: [femm] Superconductor model
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Tue, 08 May 2001 17:37:27 -0400
- Organization: Foster-Miller, Inc.
- References: <9d98sk+kn65@eGroups.com>

    Vencislav wrote:

    > Hello,
    >
    > this is my first question in this group:
    >
    > how do I make a model of superconductor in femm?
    >
    > I'm trying to see how will magnetic field behave
    > when there is superconductor, since we know that
    > superconductors do not let magnetic field lines
    > go through it.
    >

    The easiest way to model a region filled with a perfect conductor is just to
    assign it an extremely low permeability. You can't assign a region a
    permeability that is exactly zero, because the problem would be too badly
    conditioned to solve. But that's ok--assigning a relative permeability of
    0.001 excludes flux nicely and generally solves ok.

    Somebody even got a paper out of this technique once. If you are interested,
    you can check out:
    A. Konrad and M. Graovac, ?The finite element modeling of conductors and
    floating potentials,? IEEE Transactions on Magnetics, 32(5):4329-4311, Sept.
    1996.

    Dave Meeker

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    org:Foster-Miller, Inc.;Electrical and Electronic Systems Group
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    - From: "Vencislav" <vencib@yahoo.com>

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