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# Re: Magnetic Field Source

- To: femm@yahoogroups.com
- Subject: Re: Magnetic Field Source
- From: "tano1938" <rgarritano@comcast.net>
- Date: Thu, 10 Apr 2003 21:39:33 -0000
- In-reply-to: <b6hgre+hfln@eGroups.com>
- User-agent: eGroups-EW/0.82

    Thanks for the explanation. I think I'm starting to understand it.
    Is it true then that A is always applied in the C3 direction when
    working with planar problems so that the flux is in the XY plane?
    For some reason, I thought it was directed up, in the Y direction.
    For axisymmetric problems, what is the direction of A?

    Ron

    --- In femm@yahoogroups.com, "David Meeker" <dmeeker@i...> wrote:
    > --- In femm@yahoogroups.com, "tano1938" <rgarritano@c...> wrote:
    > > I'm a first time user of femm. I've been working through the
    > > tutorial and am confused by the units and significance of
    > > the "Magnetic Field Source", i.e. Weber/meter. How does it
    relate to
    > > Magetic Intensity (H) or Flux Density (B). Since it is a user
    input,
    > > I'd like to know how to apply it to a practical situation. I've
    > > never had to use it before, but I've never used an FEA program
    before
    > > also.
    > >
    > > Thanks for your help.
    >
    > In this example, the idea was to model a block sitting in a magnetic
    > field that would be constant in the absence of the block. In this
    > case, you can set the magnitude of the field, over a square domain,
    by
    > setting the potential at one edge of the domain to be zero, and the
    > potential at the other edge of the domain to be (flux
    > density)*(length) where (length) is the length of one of the sides
    of
    > the square.
    >
    > This is perhaps not the most typical sort of problem. In most
    cases,
    > the field is driven by coils or permanent magnets that are
    explicitly
    > modeled as part of the solution domain--most of the included example
    > problems are like that. In those cases, you can define potential to
    > be zero at some suitably far distance from the objects of interest
    (or
    > you can use one of the more subtle "open boundary" techniques
    > discussed in the manual).
    >
    > Dave.

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- References:
  - Re: Magnetic Field Source
    - From: "David Meeker" <dmeeker@ieee.org>

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