Re: Magnetic Field Source

["mvalca" <mvalca@xxxxxxxxx>]

Hello Ron, 
the vector potential is always "out of page", so for the planar 
problem is perpendicular to the XY plane and for axisymmetric 
problems to the RZ plane

Marco

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