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# novice user: on track or not?

- To: femm@yahoogroups.com
- Subject: novice user: on track or not?
- From: "r_dingo" <rd@labyrinth.net.au>
- Date: Sun, 04 May 2003 13:40:37 -0000
- User-agent: eGroups-EW/0.82

    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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