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# [FEMM] Help again

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- Subject: [FEMM] Help again
- From: "Bruce G. Kang" <xiandaiwuxue@yahoo.com>
- Date: Fri, 19 Dec 2003 13:15:32 -0800 (PST)
- Cc: gkang68@yahoo.com
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    Dear David:

    I need your help again. Please see attachment in
    figures about the question:

    1. for ferrite, we want to know the leakage field at
    one side region about 3~5 times the ferrite dimension.
    basically it is a 3D problem. You suggested to use BEM
    methods to solve it. But I found BEM is difficult to
    pick up.

    2. Is this a good idea? To change the vector problem
    into a potential problem as in "Answer.bmp"? Due to
    mu_r is much larger than 1, we can claim each side
    have different potentials. The rest will be a
    finite-difference problem to get all the potential
    distribution of the region. B will be the gradient of
    potential.

    Please comment and suggest.

    Best Wishes,

    Bruce

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  - Re: [FEMM] Help again
    - From: David Meeker <dmeeker@foster-miller.com>

- References:
  - Re: [FEMM] Origins of the superposition theory.
    - From: David Meeker <dmeeker@foster-miller.com>

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