Re: [femm] How to do a B or H "black box" generator in a perpendicular plan to the working

[David Meeker <dmeeker@xxxxxxxx>]

jire602000 wrote:

> Hello every body,
>
> With the Prescribe A boundary condition, B or H can be imposed in
> the x y (r, z) 2D plan of the study . But how can I make it
> perpendicular to this plan ? I want it in the same direction as the
> current of the circuit property of a copper wire for example.
>
> This trick can also be achieved by having a current in a cooper wire 
> running in the x y 2D plan and not in the perpendicular plan as usual.
>
> So , I need help and advise !
With femm, flux always flows in the plane of the screen and currents 
flow in the into-the-page direction. You can't solve the sort of 
problem that you are thinking about with femm, where you want flux to 
travel in the into-the-page direction.

You might be able to solve this problem with Maxwell SV, which Ansoft 
has recently made available free-of-charge. See 
http://www.ansoft.com/maxwellsv/ This is a student version of their 2D 
program, and it's actually quite powerful. There seem to be no mesh 
size limits--the program just doesn't include what they must consider to 
be more advanced features, like parametric analyses, transient analyses, 
etc. It sounds like your type of problem could be addressed by their 
"eddy axial" solver. For an explanation of the formulation, see: 
http://www.ansoft.com/support/workshops/emworkshop/Eddy_axial.pdf

Dave.

--
David Meeker
email: dmeeker@xxxxxxxx
www: http://femm.berlios.de/dmeeker