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# Re: novice user: on track or not?

- To: femm@yahoogroups.com
- Subject: Re: novice user: on track or not?
- From: "David Meeker" <dmeeker@ieee.org>
- Date: Mon, 05 May 2003 14:18:13 -0000
- In-reply-to: <b9358l+qc8g@eGroups.com>
- User-agent: eGroups-EW/0.82

    This sounds a little odd--it's hard to say what's going on without
    seeing your model. Anyhow, I've uploaded a model of the sort of
    geometry that you'd described that seems to behave in a reasonable
    way. It's in the mailing list's Files section at:
    http://groups.yahoo.com/group/femm/files/2magnets.zip

    Dave.

    --- In femm@yahoogroups.com, "r_dingo" <rd@l...> wrote:
    > Hi all
    >
    > I'm a novice to using FEMM. I'm finding that solutions often look a
    > little unexpected. Probably this just means that I don't know much
    > about magnetic fields. However, it would be good to know whether I
    > have set up the program correctly.
    >
    > For example: imagine a pair of cylindrical magnets, with their long
    > axes collinear, and unlike poles facing each other across a moderate
    > airgap (width similar to the diameter of the magnets). The solution
    > shows that there is a circular locus of zero field strength
    > surrounding the gap between the poles (ie, lying in the plane which
    > bisects the air gap and is normal to the axis of symmetry).
    > Furthermore, this ring of zero field strength is fairly close in -
    > it's definitely part of the near field, not the far field. Without
    > the benefit of any training in EM theory, I had expected the high
    > local field strength between the poles would decrease monotonically
    > out into the far field pattern, without any near-field minima.
    >
    > Is the solution correct, or have I set up the model incorrectly?
    >
    > Thanks, Ross

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  - novice user: on track or not?
    - From: "r_dingo" <rd@labyrinth.net.au>

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