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# Question about force calculation

- To: femm@egroups.com
- Subject: Question about force calculation
- From: "Rob " <rtickle@visi.com>
- Date: Tue, 19 Dec 2000 09:48:15 -0000
- User-agent: eGroups-EW/0.82

    Hi David,

    First of all, many thanks for an impressive piece of freeware - this
    program is very nice! I've been searching for a public domain piece
    of FEM software for magnetics, and my search ended when I found yours.

    I am currently modelling a simple C-core type electromagnet with
    circular pole faces. I am trying to get a calculation of the pull
    force on the pole pieces, but not sure how to approach this. I've
    tried drawing a closed contour which encloses a pole face around one
    of the pole pieces, with 3 sides in air and the 4th intersecting one
    of the core arms, but the force value I got seemed very high. I read
    in the manual about the problems related to crossing boundaries of
    materials with varying permeability and problems with mesh size. I'm
    wondering if the large value I got is due to these issues and if
    there is a better way to do this calculation.

    All the examples I've seen of force calculations are of parts which
    are isolated from the rest of the geometry, allowing closed curves in
    air to be used. Any suggestions on how to approach this?

    Thanks very much, Rob

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