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# [femm] Re: Current Density X-Y plot problems

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- Subject: [femm] Re: Current Density X-Y plot problems
- From: Dcm3c@aol.com
- Date: Thu, 13 Jan 2000 10:03:18 EST
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    In a message dated 1/12/00 12:50:22 PM Eastern Standard Time,
    mperry@azcore.com writes:

    > Dave,
    >
    > Thanks for your response.
    >
    > Even if I can't get the absolute value of the distribution can I get a
    > relative feel?
    > I guess what I would like to know is that will FEMM give me the proper
    > distribution shape with just the scale being off. If I export the data
    > from FEMM plot for J and integrate this across the length (density
    > constant in Y axis) can I back out the total current in the section? If
    > so I could then adjust the input J to get to where I need to be.
    >
    > Am I on the Right track or out in left field?

    Well, it's not that the scale is `wrong' per se, it's just the formulation
    that's used. This way of doing harmonic problems comes out of Hoole's
    ``Computer-aided analysis of electromagnetic devices,'' in which excitation
    in harmonic problems is defined as source currents. The total current is
    then the sum of the source and reaction currents.

    At any rate, you can always do a block integral over the coil to get the
    total current in the coil, because induced currents are included in this
    integral. Since all harmonic problems addressed by the program are linear,
    you can simply scale any field quantity to the total current level you want.

    > Do you have a feel for when you will be releasing the next version?
    >
    > Thanks again.
    >
    > Marty

    Things are going somewhat slow, so it's hard to say exactly when a new
    version will come out. I haven't had too much time lately, and there are a
    lot of changes that I want to make before the next ``real'' release to add
    functionality and to fix some aspects of the program that irritate me. In my
    development version, I have already added the ability to add constraints on
    currents in eddy current problems, so that all regions aren't effectively
    ``shorted together at infinity,'' and I've also added the ability to join
    different entities together into groups, so, for example, one could turn the
    orientation of a rotor with a single command rather than laboriously moving
    each line, arc, block label, etc. I have yet to add the
    periodic/antiperiodic boundary conditions that have been previously
    discussed. I want to include this before I put out the next release, as well
    as make several other, more minor, changes.

    Dave.

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