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# Re: [femm] Re: What is the best way to model Horseshoe magnets

- To: femm@yahoogroups.com
- Subject: Re: [femm] Re: What is the best way to model Horseshoe magnets
- From: "Peter Ceelen" <peter.ceelen@ct.boc.com>
- Date: Thu, 16 Aug 2001 08:13:22 -0700

    The magnet is indeed one piece, I guess I didn't make that clear. The corners
    aren't as sharp as the models would indicate. Perhaps a better way to model it
    is with wedges that do not have corners that all meet at the same point (as
    shown in the attached model). If anyone has any suggestions I would be happy to
    hear them. This problem would be common to many magnets that don't have a
    rectangular cross section.
    (See attached file: Horseshoe 5.FEM)

    "David Meeker" <dcm3c@aol.com> on 08/15/2001 05:44:12 PM

    Please respond to femm@yahoogroups.com

    To: femm@yahoogroups.com
    cc: (bcc: Peter Ceelen/BOCCT)

    Subject: [femm] Re: What is the best way to model Horseshoe magnets

    --- In femm@y..., "Peter Ceelen" <peter.ceelen@c...> wrote:
    > What is the best way to model a horseshoe (U shaped) magnet with the
    > poles on the top faces? The particular magnets I am trying to model
    > are a rectangular U in shape. I have modelled them as a single
    > body, as three bodies that meet at a 45 degree angle, and with
    > increasing numbers of wedge shaped bodies in the corners that
    > meet at correspondingly smaller angles as the number of bodies
    > increases. These all give different results and I am wondering
    > which of these ways is the most accurate. I have included simple
    > models as examples. [...]

    Hmmm--this is sort of an interesting question. The method with lots
    of wedges does act diferent because there's these little loops of flux
    that circulate by the interior corners, sort of constricting the flux
    path. Alternatively, the method with "three bodies that meet at a 45
    degree angle" makes flux lines that practically turn a 90 degree
    corner at the joints, using the entire cross-section of the magnet.

    I'd guess that the most "accurate" way to model it would depend upon
    how you'd build the thing. I could imagine physically constructing it
    out of three pieces and actually building the "three bodies that meet
    at a 45 degree angle" configuration. But what I'm guessing that you
    are thinking of is building the U and magnetizing as one piece. You
    might have to do something subtle like try to model the U in the
    magnetizing fixture to see how it orients the magnetization.

    Anyhow, I know that there are a few list members who work at companies
    that design and manufacture permanent magnets. Any suggestions?

    Dave Meeker
    http://members.aol.com/_ht_a/dcm3c

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Attachment: `Horseshoe 5.FEM`
Description: Binary data

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