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# Re: Force calculation on an axisymmetric model

- To: femm@egroups.com
- Subject: Re: Force calculation on an axisymmetric model
- From: jim271@hotmail.com
- Date: Tue, 03 Oct 2000 15:00:36 -0000
- In-reply-to: <3.0.5.32.20000929182911.00881400@sun.isec.pt>
- User-agent: eGroups-EW/0.82

    --- In femm@egroups.com, Paulo José Gameiro Pereirinha
    <ppereiri@s...> wrote:
    > Hello!
    >
    > I'm in Portugal and trying to compute the atraction magnetic force
    on an
    > plunger electromagnet with axisymmetric geometrie. I'm using the
    Femm 3.0.
    > To compute the force exerced on the iron can I just define a
    contour in the
    > air around the iron (which means that one side of the contour will
    be on
    > the line of coordinate z=0) and integrate the Maxwell Stress
    Tensor? (i.e.
    > is this command valid for axisymmetric models?). If I do so, I
    obtain
    > -2.783e-3 N, but the experimental result is about 1.35 N. I'm
    sending the
    > model in attachement.

    After changing the permeability, as Dr. Meeker pointed out, you might
    also check your model for the current density of your coil. The
    force is proportional to the current squared, so a 50 or 60 percent
    increase in current density will make the calculated force close to
    your measured value.

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    - From: Paulo José Gameiro Pereirinha <ppereiri@sun.isec.pt>

- References:
  - Force calculation on an axisymmetric model
    - From: Paulo José Gameiro Pereirinha <ppereiri@sun.isec.pt>

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