Re: Magnetic Field Source

["tano1938" <rgarritano@xxxxxxxxxxx>]

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@xxxxxxxxxxxxxxx, "David Meeker" <dmeeker@xxxx> wrote:
> --- In femm@xxxxxxxxxxxxxxx, "tano1938" <rgarritano@xxxx> 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.