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# Re: [femm] periodic boundary condition problem

- To: femm@yahoogroups.com
- Subject: Re: [femm] periodic boundary condition problem
- From: Jiri Vecerka <vecerkaj@yahoo.com>
- Date: Fri, 6 Dec 2002 03:51:50 -0800 (PST)
- In-reply-to: <3DF00720.7040101@ieee.org>

    Just a note. If you want to calculate torque in
    dependence on the angle of rotation (whether with
    stator current or not) you will get a problem how to
    rotate the rotor (because the contour for the torque
    calculation should be away from a boundary).
    Sometimes its easier way to calculate entire machine
    and simply rotate.

    Jiri Vecerka

    >
    > 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.
    >
    > --

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

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