Re: [femm] Superconductor model

[David Meeker <dmeeker@xxxxxxxxxxxxxxxxx>]

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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