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# Re: [femm] Re: Approximation of non-axisymmetric geometry

- To: femm@yahoogroups.com
- Subject: Re: [femm] Re: Approximation of non-axisymmetric geometry
- From: David Meeker <dmeeker@ieee.org>
- Date: Sat, 09 Aug 2003 09:30:37 -0400
- In-reply-to: <bgu8cr+mof3@eGroups.com>
- References: <bgu8cr+mof3@eGroups.com>
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jflrlk wrote:

> `Hi,
> I have a very similar situation, I would like to know the solution
> too.
> The motor we have is bascically axisymmetric, except that the
> polarities of the surface mounted PMs around the rotor are
> alternating, and there exists epoxy between every two adjacent PM
> blocks. Does anybody know how I can model these PMs by an equivalent
> axisymmetric case?
> Thanks a lot!
> `

>From this description, it sounds one you can't really approximate this one as axisymmetric. It sounds like more of a 2D planar problem, where most of the flux flows in the plane of the alternating magnets, rather than making axial loops--however, it's hard to say exactly how to attack your problem without seeing what you are trying to model.
In general, there could be an axisymmetric-like formulation (in the sense of only having to mesh over r and z) in which the fields vary sinusoidally in the tangential direction. This is a similar idea to time-harmonic problems, in which the field is assumed to vary sinusoidally with respect to time--the sinusoidal variation is just with respect to a spatial direction, rather than with respect to time. However, FEMM doesn't solve that particular class of problem right now.
Dave.

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

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