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# Re: [femm] Problem in force calculations

- To: <femm@egroups.com>
- Subject: Re: [femm] Problem in force calculations
- From: "Eckart Nipp" <eckart.nipp@m-v-l.de>
- Date: Fri, 26 May 2000 15:55:17 +0200
- Reply-to: "Eckart Nipp" <Eckart.Nipp@m-v-l.de>

    Hi,

    integration contours on surfaces are likely to cause errors in force
    computations. Furthermore take care that the contour is closed. Besides
    moving the outer boundaries far enough away, I would suggest to set
    zero A on them.

    Another question is the approximation of the actual 3D situation by a 2D
    problem. Is the geometry rotational symmetric? Or is the approximation
    by an infinitesimal long geometry applicable?

    In addition I think in this case you must take great care of dimensions,
    permeability, saturation, magnetization, etc.. Just think about what happens
    if the steel sheet is very thin or very thick. The behaviour would be
    completely differnt.

    Eckart

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