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# Modelling loudspeaker magnets..

- To: femm@yahoogroups.com
- Subject: Modelling loudspeaker magnets..
- From: "emacoustics" <michael.wheeler@ic.ac.uk>
- Date: Fri, 01 Mar 2002 14:16:17 -0000
- User-agent: eGroups-EW/0.82

    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

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