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# Re: [femm] Problem in force calculations

- To: femm@egroups.com
- Subject: Re: [femm] Problem in force calculations
- From: Dave Squires <djsquires@plix.com>
- Date: Fri, 26 May 2000 07:47:52 -0700
- References: <002b01bfc71a$06b3b160$ce0c310a@iap_16.m-v-l.de>

    Eckart Nipp wrote:

    > 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.

    I have even been careful to make sure that the contour is equidistant
    all the way around by using the snap grid feature and making sure I
    go clockwise. The snap grid feature insures closure of the contour.

    >
    > 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?

    This might be part of it. In reality you have a 3D situation. This one is
    not axi-symmetrical. It is just two magnets and an iron plate between them.

    > 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.
    >

    Of course. That is what I am trying to simulate. A thicker piece will show
    a switchover from repulsion to attraction in real life.

    Dave Squires

- References:
  - Re: [femm] Problem in force calculations
    - From: "Eckart Nipp" <eckart.nipp@m-v-l.de>

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