On Jan 16, 2:23 pm, "Bill Miller" <billmillerkt...@worldnet.att.net
wrote:
"bob" <opste...@hotmail.com> wrote in message
news:57246423-9799-41c7-a821-69c9fa02e6bf@d4g2000prg.googlegroups.com...
On Jan 16, 2:04 am, Benj <bjac...@iwaynet.net> wrote:
On Jan 15, 11:08 pm, bob <opste...@hotmail.com> wrote:
I am having trouble defining a "Function of Position" for a current
density source. Does anyone know how to do this, or better yet could
possibly email me a project file, as an example, where this has been
done.
Hey Bob,
"function of position" means just what it says. It means the current
density depends upon where you are in space (which usually means
position inside the conductor). If you have a defined current density
distribution then that distribution is already a "function of
position". The usual problem, however, is that we start with circuit
elements which define equipotential terminals in space to which a
distributed and variable conductive geometry is attached that creates
the distributed current density. The problem is that only the geometry
and terminals are defined. To obtain the current density distribution
you must solve a differential equation that gives the distribution you
seek as a solution. Yes, I know how to do this in some simple cases,
but this is not simple stuff so no, we really can't help you. A few
graduate level courses in the subject ought to get you started! :-)
Thanks for the reply. Actually I have a decent understanding of diff.
equations and Maxwell's. My question was a software question for
Ansoft's "Mawell 3D" FEA software. I have a coil that I modeled as a
large toroid (with square CS). The J density function is, for my case,
using cartesian coordinates:
Jx=Jmag*(z/sqrt(x*x+z*z))
Jx=Jmag*(x/sqrt(x*x+z*z))
Jy=0
The problem I'm having is defining the above equations in the Boundary/
Source Manager under Model -> Function. The functions I'm trying to
define "Maxwell 3D" calls "Functions of Position" in there help files.
I can't find any examples on the web.
Maybe someone knows how to do this, or better yet has a Maxwell 3D
project on hand that I can learn from.
Thanks
But maybe you can help ME!
I downloaded the student version, (free) but it seems to assume that the
student will have a teacher somewhere. I can't figure out how to get it
to
do anything. There don't seem to be any examples or nothin'.
Suggestions?
Bill
If you go to Ansoft's website there is a tutorial for the 2D FEA
program (Under Downloads,
http://www.ansoft.com/maxwellsv/MaxwellSV_Magnetostatic.pdf)
If I were you though, I would look at FEMM (google "FEMM"). It's also
a free 2D solver, but is much more versatile then Ansoft's free 2D
solver. I have done a lot of simple and complicated projects with FEMM.
