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# Re: FEMM simulations errors ??

- To: femm@yahoogroups.com
- Subject: Re: FEMM simulations errors ??
- From: harti@harti.com
- Date: Tue, 12 Jun 2001 21:07:02 -0000
- In-reply-to: <200106121512412.SM00808@m2w070>
- User-agent: eGroups-EW/0.82

    To explain it a bit more:

    Look at the posted GIF pic.

    I drew a clockwise red bouding box
    at the additional 4 points in the air
    which I placed additionally in the fem
    model near the 2 runner magnets (called "runner stack")

    When I integrate it this way and use the "Force from Stress Tensor"
    I get around +640 N/m into x-Direction,
    but as you can see, the runner stack must move to the left side,
    due to the reduced magnetic field at the left side, so the calculated
    force is into the wrong direction !
    So is this a FEMM error or do I still have to make the mesh still
    finer ?
    The dimensions are:
    2 neodym stator magnets 10 cm x 1 cm and 2 runner magnets
    3 cm x 1cm, 2 cm thick steel core as back flux core.

    --- In femm@y..., "hartiberlin@p..." <harti@h...> wrote:
    > Hi all,
    >
    > enclosed is a pic from
    > the simulation and the
    > *.fem file.
    > I get 640.9 N/m butinto the wrong
    > direction, when I use a clockwise
    > integration path !
    >
    > Is this a FEMMvies error ?
    > or did I something wrong ???
    > Regards, Stefan.
    >
    > --------------------------------------------------------------------
    > Mail2Web - Check your email from the web at
    > http://www.mail2web.com/ .

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- References:
  - Re: PMSquare FEMM simulations errors ??
    - From: "hartiberlin@pop3.freenet.de" <harti@harti.com>

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