|
Thanks very much.
I like the software more and more every time I use
it.
Eric.
----- Original Message -----
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@xxxxxxxx
www: http://femm.berlios.de/dmeeker
Your
use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
|