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# Approximation of non-axisymmetric geometry

- To: femm@yahoogroups.com
- Subject: Approximation of non-axisymmetric geometry
- From: "niallcaldwell" <niall.caldwell@ed.ac.uk>
- Date: Thu, 07 Aug 2003 12:29:18 -0000
- User-agent: eGroups-EW/0.82

    Hi all,

    Firstly thanks to David Meeker for writing such a great program- I was
    using ANSYS for years, writing scripts for parametric optimisation of
    solenoid valves. It is very powerful but a complete pig to use. I
    have moved to femm because it is so much quicker to set up and change
    geometry. The inclusion of Lua means it is just as good as ANSYS for
    most design optimisation.

    My question is not really femm-specific, but maybe some of you have
    tackled it before...

    I have a mainly axisymmetric solenoid valve. The moving pole in real
    life has radial slits in it (for non-magnetic reasons) leaving it only
    50% solid in places. I am wondering what the best way is to
    approximate this non axisymmetry.

    One thought I have had is to define a new steel, based on the B-H
    curve of 1006 but with the B values divided by half (making sure that
    the final gradient equals mu0). I would use this new 50% steel over
    the slitted area. By building a library of 30%, 50%, 70% etc. steel I
    could model the slitting percentage across the radius of the moving
    pole by dividing it into zones of different material.

    I suspect there is a fatal flaw in this somewhere.... anyone got a
    better idea (apart from 3D modelling that is!)

    thanks

    Niall Caldwell

- Follow-Ups:
  - Re: Approximation of non-axisymmetric geometry
    - From: "jflrlk" <jflrlk@yahoo.com>
  - Re: [femm] Approximation of non-axisymmetric geometry
    - From: David Meeker <dmeeker@ieee.org>

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