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# Re: Crosstalk mode? / --> transformer calculation summary

- To: femm@yahoogroups.com
- Subject: Re: Crosstalk mode? / --> transformer calculation summary
- From: corneliuspaul@gmx.de
- Date: Fri, 13 Jul 2001 14:08:00 +0200 (MEST)

    SE-HO YOU wrote:
    >Has anyone tried to cross talk model with FEMM ? For example,
    >If I have two or more rectangular conductors (only one conductor has a
    >source), then can I get inductance or current from the quite (or victim)
    >line ? As some texts put it, can I be able to calculte capcitance or
    >inductance coulping coefficients?

    hello everyone,

    as is evident from my former posts to the group I am also in the process
    of learning how to use FEMM for transformer calculations.
    This includes the calculations of self inductances, mutual inductances,
    leakage inductances, core flux and induction values (saturation problems).
    Thanks to discussions mainly with Dave and Keith I am beginning to see
    things a bit more clearly and am in the process of writing a little
    "TRANSFORMER TUTORIAL" for myself, which will be a collection of the
    various methods for calculating these parameters. to be used as a quick
    lookup reference. And I hope it will not be full of errors... :-)

    I should have this tutorial finished in the next weeks (...other work to
    be done as well...). Anybody interested in this summary please drop me an
    email and I will mail it to you when I am finished.

    SE-HO: I think what you call cross-talk is what I call mutual (inductance)
    so it will be covered in the summary. However, the general process
    is that you have to calculate the coupling coefficient (can be done
    with FEMM), then calculate the induced current in the second coil
    by hand. It can not be done automatically in a 2D model. For a final
    picture of the fields emanating from the 2 coils you have to put
    a current source on either coil, using the values you calculated
    by hand.

    RUKMAL: sri I did not come back to your last post, too busy but havent
    forgotten

    a nice weekend to everyone, regards,
    Cornelius

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