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# Re: [femm] Horse shoe magnet

- To: femm@yahoogroups.com
- Subject: Re: [femm] Horse shoe magnet
- From: David Meeker <dmeeker@ieee.org>
- Date: Mon, 23 Dec 2002 10:16:38 -0500
- References: <au6uk1+mpb2@eGroups.com> <3E071520.4050408@ihug.com.au>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826 MultiZilla/v1.1.22

`Robert Strand wrote:`

>     Hi,
>     eavogels wrote:
>     > I need to make a femm model of a horse shoe magnet but I don't know
>     > how to do it since the magnetic direction is ofcource different in
>     > both ends. How should I solve this: creating a lot of small magnets
>     > in the form of a horse shoe or does someone know a better way. If
>     > someone has a sample he wants to share, please send it to

> `I don't think it is possible with FEMM. FEMM only solves 2-D planar and
> axisymmetric magnetic problems. The horseshoe is a full 3-D problem, and I
> can't see a way of transforming the problem even with it's lines of symmetry.`

>     Regards
>     Rob

`
Most horseshoe magnets that I've seen are not very deep in the into-the-page direction. I'd agree that you'd need a 3D approach to analyze that sort of geometry, because there would be a huge amount of fringing that would not be captured by a 2D model. However, it ought to be possible to make a model of a horseshoe that is long in the into-the-page direction. The results would then give a reasonable approximation of the fields that you'd observe towards the middle of the magnet. I've attached an example of this sort of magnet. As Eric had suggested, I built it up out of a bunch of sections that each have a slightly different direction. Just for overkill, I've used the "Kelvin Transformation" method to model the magnet sitting in an unbounded domain.`

    Dave.
    --
    David Meeker
    email: dmeeker@ieee.org
    www: http://femm.berlios.de/dmeeker

Attachment: `zip00044.zip`
Description: Zip compressed data

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- References:
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    - From: "eavogels <eric.vogels@telia.com>" <eric.vogels@telia.com>
  - Re: [femm] Horse shoe magnet
    - From: Robert Strand <rstrand@ihug.com.au>

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