Re: [femm] Re: Current

[Keith Gregory <k.gregory@xxxxxxxxxxx>]

At 20:29 22/07/2002 -0400, you wrote:
> brian_hawes wrote:
> > Keith,
> > Thanks for the reply. My problem is thus: I have a simple simulation
> > of a single curent carrying ring. I have defined the current density
> > in the model for the copper. If I simulate at very low frequency, 
> > such that skin and proximity effects are negligable, then the total 
> > current, found by using the block integral feature in FemView, is 
> > what I would expect - J x Area. Now, if I increase the frequency such
> > that skin and proximity effects occurr, then the total current, 
> > measured with FemView appears to fall. I would expect, as you say, 
> > that the total current would remain constant, and just be 
> > redistributed.
> > Brian
> If you define a "source current
> density," this is defines the current that you would get at 0
> Hz.  At nonzero frequencies, in conductive regions, some of the
> current gets bucked by inductance.

I think I had begun to work this out looking at a similar situation to
that Brian has been using. The current density seems to act in a manner
similar to what would occur if a constant voltage was applied to the
region  rather than a constant current. Am I on the right track or
is it not this simple?

 Keith.