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# [femm] No Subject

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- Subject: [femm] No Subject
- From: mathewsd@earthlink.net
- Date: Tue, 26 Oct 1999 16:11:54 -0700
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    I hope this is the proper forum for a question on the correct boundary
    conditions for the A vector in cylindrical coordinates. If not, I
    apologize.
    The simplest model of my system is an iron disk with a cylindrical air
    slot that has copper plated walls. The slot contains a solenoid which
    is fed by a sinusoidal current. The induced currents in the copper
    plating generate a B field which isn't negligible. I need to know
    that current so I can calculate heat dissipation. I also need to know
    B "everywhere."
    My plan is to solve for the A vector and then use it to calculate B in
    the slot, but I'm worried about how to handle the boundary conditions
    at the copper. Do I calculate the induced currents in the inner and
    outer copper walls first and then use them as two extra sources in a
    second calculation, or what? I'm willing to assume constant, very high
    permeability.
    I have been using PDEase and just learned about FEMM in the last week
    or two.

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