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# Re: [femm] Horse shoe magnet

- To: <femm@yahoogroups.com>
- Subject: Re: [femm] Horse shoe magnet
- From: "Eric Vogels" <eric.vogels@telia.com>
- Date: Tue, 24 Dec 2002 21:31:47 +0100
- References: <au6uk1+mpb2@eGroups.com> <3E071520.4050408@ihug.com.au> <3E0728D6.5030603@ieee.org>

Thanks very much. I like the software more and more every time I use it. Eric. ----- Original Message ----- From: David Meeker To: femm@yahoogroups.com Sent: Monday, December 23, 2002 4:16 PM Subject: Re: [femm] Horse shoe magnet `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 someoneknow 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` `Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.`

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

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