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# [femm] Simmetry on planar problems

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- Subject: [femm] Simmetry on planar problems
- From: Sincro <tecnico@sincro.it>
- Date: Wed, 12 Jan 2000 17:14:05 +0100
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    Thank you Dave, I have installed premesh.exe and everything works fine.
    There is something more that I would like to ask. Since rotating machinery have a good simmetry, is there a way to model only a slice of the machine (1 or 2 poles) and tell the program that along a segment there is a simmetry in tangential and/or normal components of the field or that along the two radial segments of the slice the vector potential must be the same? In this way I could save a lot of CPU time to obtain the same information (especially when I perform several calculations to find the best solution).
    In future versions it would be interesting and time saving to have the possibility to suggest a starting point for the kernel iteration (a .ans file) when I have the same geometry and different (but not too much) currents.

    Thank you for your attention.
    G.Bortolan

    P.S. My address is tecnico@sincro.it or, if you prefer gbor@sincro.it.

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