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# Re: novice user: on track or not?

- To: femm@yahoogroups.com
- Subject: Re: novice user: on track or not?
- From: "r_dingo" <rd@labyrinth.net.au>
- Date: Mon, 05 May 2003 17:52:53 -0000
- In-reply-to: <b95rr5+b8hl@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "David Meeker" <dmeeker@i...> wrote:
    > 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.
    >

    Yes, this is the model I have used also, since you can't go any
    simpler. I have run your version and find the same result. If you
    run your version and then tweak the view as follows:
    Zoom/Keyboard: B -0.5 L -0.3 T 0.5 R 1.11,
    View/Density Plot: lower 0, upper 0.05,
    then you will see an island of zero flux density centred at r=0.5
    in. Since this is an axisymmetric solution, it represents a toroidal
    region of very low flux density circling around the airgap. Its
    radius of 0.5 inch means that it's fairly close in, as I said.

    Alternatively, you can draw a horizontal plot-XY line radially
    outwards from the centre of the airgap, eg, from (r=0, z=0) to
    (r=0.8, z=0), and you will see that:
    |B| = 0.61T in the central axis, falling rapidly to ...
    |B| = 0 at r=0.5 in, then rising slowly to ...
    |B| = 0.015T at the far field maximum at r=0.3 in.

    This zero point seems to present in a wide variety of conformations.

    Cheers, Ross.

- Follow-Ups:
  - Re: [femm] Re: novice user: on track or not?
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- References:
  - Re: novice user: on track or not?
    - From: "David Meeker" <dmeeker@ieee.org>

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