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# Re: Can femm model this?

- To: femm@yahoogroups.com
- Subject: Re: Can femm model this?
- From: "wigstonmagna" <andrew_ppp@hotmail.com>
- Date: Sun, 03 Aug 2003 19:17:17 -0000
- In-reply-to: <bgi30o+bju9@eGroups.com>
- User-agent: eGroups-EW/0.82

    --- In femm@yahoogroups.com, "David Meeker" <dmeeker@i...> wrote:
    > --- In femm@yahoogroups.com, "wigstonmagna" <andrew_ppp@h...> wrote:
    >
    > > But when looking down the axis of the coil (in the z direction
    let's
    > > say), and imagining the plates to extend to +/- infinity in "z",
    > > (they are now rectangular), and since any planar cross-section be
    the
    > > same as any other, wouldn't this be OK?
    > > -Andrew
    >
    > This isn't a good approximation of your problem. If you take this
    > cross-section and extend to infinity in the out-of-the-page
    direction,
    > there's no end of the coil, so all the flux stays inside the coil.
    > Since your "real" coil is finite in extent, and you are specifically
    > interested in the interactions of the coil with the plates, this
    isn't
    > a good approximation.
    >

    Thanks David - my original intuition was correct then. Ho Hum :(
    -Andrew
    > Also, FEMM only does 2D problems in which the flux flows in the
    plane
    > of the screen and current flows in the out-of-the-page direction.
    > FEMM doesn't do problems where the flux flows in the out-of-the-page
    > direction and currents flow in-plane, like we were mentioning above.
    > I think MaxwellSV's "Axial Eddy" problem type will solve eddy
    current
    > problems where flux travels inthe "out-of-the-page" direction (DC
    > problems of this type are typically trivial).
    >
    > Dave
    > --
    > David Meeker
    > http://femm.berlios.de/dmeeker

- References:
  - Re: Can femm model this?
    - From: "David Meeker" <dmeeker@ieee.org>

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