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# RE: [femm] periodic boundary condition problem

- To: <femm@yahoogroups.com>
- Subject: RE: [femm] periodic boundary condition problem
- From: "Juan Tapia" <jtapia@die.udec.cl>
- Date: Fri, 6 Dec 2002 08:09:37 -0300
- Importance: Normal
- In-reply-to: <3DF00720.7040101@ieee.org>

great!!1..thanks!
Juan

> -----Original Message-----
> From: David Meeker [mailto:dmeeker@ieee.org]
> Sent: Thursday 5 de December de 2002 23:11
> To: femm@yahoogroups.com
> Subject: Re: [femm] periodic boundary condition problem
> `enp enp wrote:
> > Hi,
> >
> > It depends on your problem. If you would like to
> > nalyse no load. You may just model one pole or 1/2
> > pole span of the PM machine.
> > If you analyse the on load operation. you would need
> > to model at least one pole ans set the anti-periodic
> > conditions at the azimutal boundaries.
> > You can also model two poles you must set in this case
> > the periodic conditions on these boundaries.
> > On the radial boundaries in the all cases set Dirchlet
> > conditions, set the the vector potentiel to zero A=0.
> >
> > Riyad
> Another issue that the original poster may have is how to apply these
> boundary conditions within the program. Unlike "regular" boundary
> conditions, which can be applied to as many different arcs or segments
> or combinations thereof, the periodic boundary conditions are special in
> that they can only be applied to either two line segments or two arc
> segments, and each component of the pair of segments or line segments
> must have the same length. For example, if the edge that you wanted to
> make (anti)periodic was composed of 5 line segments, you'd have to
> define 5 (anti)periodic boundary conditions and apply one to each of the
> segments on the edge and its mate on the adjoining boundary.
> Perhaps all of this would be clearer with an example. I've attached
> pole's worth of a four pole PMSM (which is actually cribbed from
> Quickfield's Magn4 example). Antiperiodic boundary conditions are used
> so that only the one pole need be modeled. I've defined all the parts
> in the rotor to be in group number one, so that the rotor can be turned,
> if desired.
> Dave.
> --
> David Meeker
> dmeeker@ieee.org
> http://femm.berlios.de/dmeeker
> `
> `Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.`

- References:
  - Re: [femm] periodic boundary condition problem
    - From: David Meeker <dmeeker@ieee.org>

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