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# Re: [femm] periodic boundary condition problem

- To: femm@yahoogroups.com
- Subject: Re: [femm] periodic boundary condition problem
- From: David Meeker <dmeeker@ieee.org>
- Date: Thu, 05 Dec 2002 21:10:40 -0500
- References: <20021205152855.99289.qmail@web40403.mail.yahoo.com>
- User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.1) Gecko/20020826

`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

Attachment: `zip00042.zip`
Description: Zip compressed data

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