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Re: 8 kHz Tesla Coil

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Gerry,

Tesla list wrote:

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

On 27 Sep 2005, at 17:20, Tesla list wrote:

> Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
>
> Hi Bart,
>
> Maybe doing this would be better than nothing.  At least for close
> wound coils, the assumption may be close enough and relative
> comparisons would be valuable perhaps.
>
> In additions to Rdc and skin depth, having estimated Rac, and
> estimated Q (based on Rac, Les, and Ces) would be good additions for
> JAVATC.
>

Agreed. It will be done once I find a method that is a good approximation across some ranges. But, will need measurements to compare with.

> BTW, I dont understand why you added Rdc to Rac to come up with
> Reff.  This doesn't sound right.  Seems like Rac is Reff and is
> calculated from the effective cross sectional area of the wire based
> on skin depth (and perhaps an estimate of proximity effects thrown
> in).  As freq -> 0,  Rac becomes Rdc and is the effective R.
The equation I used was an approximation for losses which I found somewhere. I'll have to dig it up so I can give reference to it. However, tonight, I have a clogged sewer pipe - so I'll have to get back to you on the equation.

Take care,
Bart

Agree. One can consider the DC value as a special case of Reff.

Malcolm

>
> >Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
> >
> >That would certainly throw you in the ball park. We could use this or
> >similar as a generic factor for now, but it's one of those areas that
> >needs some time spent on it. Only then can we really identify a high
> >and low Q design.
>
>
>
>
>