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Re: Keeping up with the theory (was is Corum and Corumforbidden topic?)
Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>
Tesla list wrote:
> Original poster: "Ray von Postel by way of Terry Fritz
> Thanks for the information on the availability of programs.....even expensive
> ones. My
> comments were based on the method of computation using empirical equations
> than those that are general in nature. Why use approximations if there are
> better methods?
> Are you saying that the equations currently being used for distributed
> capacitance yield
> accurate and precise results and are based on Maxwell's equations? If
> the case,
> then why bother with Wheeler et al?
I'm losing track of what I said and when :) I think I said that the
lumped approximations seem to be working for people. But there are
extremely expensive programs that fully simulate a coil or systems of
coupled coils, and output multiport S-parameters.
Now there is a free program called Fastcap. Evidently it works on
geometric description files like Fasthenry. I have it on my computer,
but I haven't gotten there yet. I did make my first Fasthenry Berekely
spice model, but having PSpice, I have to figure out what to do with
it. Maybe use SpiceOpus.
> No one, so far, has convinced me that a project to come up with a general
> for the calculation of parasitic capacitance of a solenoid would not be worth
> while. The
> limitation on precision and accuracy should be the ability to readily measure
> and not on the math. Any such equation, set of equations, or procedure
> be usable
> by any one on the list who has a computer. Why any one building a coil would
> want to do so is beyond me. It seems to be a mountain that is there and has
> not been climbed.
I agree, but then I'm biased, and most people just like experimenting.
But there is a thrill that comes when a model turns out to work in real
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