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# Re: [femm] force calculation

- To: femm@yahoogroups.com
- Subject: Re: [femm] force calculation
- From: David Meeker <dmeeker@ieee.org>
- Date: Sun, 22 Jun 2003 18:54:16 -0400
- In-reply-to: <005001c33784$d9174ee0$27174a98@jtapia>
- References: <005001c33784$d9174ee0$27174a98@jtapia>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.3.1) Gecko/20030425

Juan Tapia wrote:

> `Dave..
> I try to calculate forces in a PM-iron structure (please see attached
> .fem file). I'm using the boundary condition in order to modify the
> position of the stator (central part of the structure). The problem is,
> even thought I the stator is smooth (no slot) I'm getting different
> force values for different position, which is unexpected. If I have
> smooth surface, I don't have cogging force. However, the magnetic energy
> is constant for any position. What could be the problem?
> thanks
> Juan`

The way that you built the sliding air gap geometry didn't entirely make sense topologically. I've made some minor modifications and put the results in the attached zip. Now, the force that one would calculate isn't exactly zero (because finite elements are only an approximate solution), but it's much closer than before--on the same order as the vertical force, which also ought to be zero.
Dave.

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

Attachment: `zip00050.zip`
Description: Zip compressed data

- References:
  - force calculation
    - From: "Juan Tapia" <jtapia@die.udec.cl>

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