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# Force calculations on magnetostatic problems...

- To: femm@yahoogroups.com
- Subject: Force calculations on magnetostatic problems...
- From: harti@harti.com
- Date: Mon, 11 Jun 2001 15:52:11 -0000
- User-agent: eGroups-EW/0.82

    Hi All,
    I am pretty much a newbie to FEMM and
    had only worked a bit with Quickfield before.

    So I have now tried to design with FEMM a Permanent
    Magnet Powered Motor design,
    first with a linear motor example.

    Now I have afew questions aboutthe force computation
    output of FEMM:

    1. It seems to matter, if you draw a box about a magnet
    configuration, in which direction you draw this box
    around it.

    the line integral around it saying:
    Force from Stress Tensor seems to be the only
    valid computation of forces generated in a magnet
    configuration ??

    What means Stress Tensor in this configuration ?

    It also variesa lot, depending og how many
    meshes I use...
    could this really be ?
    Does the force vary in factor 10 to 100 of how many
    mesh-pieces I use for the simulation ?

    Or doI have to use the Block integral
    withthe lorentz force output ??

    But then it shows me just only a Zero force output.
    THis can not be true.

    SO what must be used ?

    Regards,
    Stefan.

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