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# [FEMM] Modeling multiple turn coils

- To: femm@list.foster-miller.net
- Subject: [FEMM] Modeling multiple turn coils
- From: Scott <shanteserve@yahoo.com>
- Date: Wed, 22 Oct 2003 07:29:38 -0700 (PDT)
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    I use FEMM to model loudspeaker motors and coils.
    Until now, I modeled coils as a single, non-conductive
    cross-section with a current numerically equal to the
    number of turns (I model them as non-conductive to
    eliminate Hall effects that wouldn't be present in
    real coils).  In these cases,I believe the Lorentz
    force is numerically equal to the ubiquitous speaker
    parameter "BL".

    To investigate this simplification I created two
    models:  one with the single cross-section I described
    above, and one with the cross-section divided into 50
    smaller sections/blocks (to simulate 50 turns).  In
    the first case there is one material property marker
    assigned to a circuit with 5 Amps; in the second case
    there are 50 separate property markers, each assigned
    to a circuit with 0.1 Amp (5 total Amp-turns in both
    cases).

    My confusion:  I expected similar results, but found
    them very different.  Moreover, I found that I could
    get identical results if I use equal circuit currents
    in both models, regardless of how many sections in
    which the coil was divided.  Is there an error in my
    methodology for modeling turns explicitly/implicitly?
    I didn't find anything enlightening by searching prior
    messages....

    Thanks,
    Scott

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