Re: Can femm model this?

["wigstonmagna" <andrew_ppp@xxxxxxxxxxx>]

--- In femm@xxxxxxxxxxxxxxx, "David Meeker" <dmeeker@xxxx> wrote:
> --- In femm@xxxxxxxxxxxxxxx, "wigstonmagna" <andrew_ppp@xxxx> wrote:
> 
> > But when looking down the axis of the coil (in the z direction 
let's 
> > say), and imagining the plates to extend to +/- infinity in "z", 
> > (they are now rectangular), and since any planar cross-section be 
the 
> > same as any other, wouldn't this be OK?
> > -Andrew
> 
> This isn't a good approximation of your problem. If you take this
> cross-section and extend to infinity in the out-of-the-page 
direction,
> there's no end of the coil, so all the flux stays inside the coil. 
> Since your "real" coil is finite in extent, and you are specifically
> interested in the interactions of the coil with the plates, this 
isn't
> a good approximation.
> 

Thanks David - my original intuition was correct then. Ho Hum :(
-Andrew
> Also, FEMM only does 2D problems in which the flux flows in the 
plane
> of the screen and current flows in the out-of-the-page direction. 
> FEMM doesn't do problems where the flux flows in the out-of-the-page
> direction and currents flow in-plane, like we were mentioning above. 
> I think MaxwellSV's "Axial Eddy" problem type will solve eddy 
current
> problems where flux travels inthe "out-of-the-page" direction (DC
> problems of this type are typically trivial).
> 
> Dave
> --
> David Meeker
> http://femm.berlios.de/dmeeker