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# Re: [femm] Modelling loudspeaker magnets..

- To: femm@yahoogroups.com
- Subject: Re: [femm] Modelling loudspeaker magnets..
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Fri, 01 Mar 2002 13:33:08 -0500
- References: <a5o2fh+pv0q@eGroups.com>

    Here's an example.

    Dave.

    emacoustics wrote:

    > Hello folks,
    >
    > I'm kind of new to using FEMM, and am trying to model a loudspeaker
    > coil/magnet assembly for my final year university project. I'm
    > modelling to observe the effect the flux generated by the coil has on
    > the permanent magnetic field. The model is really simple - one block
    > of steel, one block of Neodinium, and one (and sometimes two) coils
    > (which are represented by square blocks at present, though may get
    > changed to circles) in the gap between them. My problem is in not
    > understanding how to input data for magnets - I modelled the system
    > with no current in the coil (and with no coil at all) expecting to
    > see field lines between the neodinium and the steel, and saw
    > nothing. When looking at material properties, there are lots of
    > values for constants I don't understand, nor did I really understand
    > the manual either. Can anybody point me in the right direction? The
    > model is just to show that the coil affects the permanent field when
    > a current runs through it, and by adding a seconc coil in antiphase
    > this can reduce this problem.
    >
    > Many many thanks, I'm getting desperate!
    >
    > Best Wishes,
    >
    > Mike Wheeler
    > Final Year Undergraduate, BEng Mechanical Engineering
    > Imperial College, London
    >
    >
    >
    >
    > Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

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- References:
  - Modelling loudspeaker magnets..
    - From: "emacoustics" <michael.wheeler@ic.ac.uk>

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