Dear Stefan,
Very nice! Wish I had the skills time and money to build one. I just threw
together a dc resonant charging tesla coil with a static gap made of copper
bus bars...
haha well there is a very big difference in quality but the same concept!
-Wil
On 20/10/2014 10:01 AM, "Teslalabor" <teslalabor@xxxxxxxxxxx> wrote:
> Hello all,
>
> as announced some weeks ago, I now want to show you my current proceedings
> with my DC resonant charging teslacoil. I just finished the rotary spark
> gap, motor driven 3-phase variac which feeds the high voltage transformer
> and also the power control box. Here is a video of it:
>
> https://www.youtube.com/watch?v=wVpRE38UXqE
>
> The rotary is made of a 450W DC Motor with a maximum speed of 12500rpm. The
> speed is controlled by a variac. The disc-diameter is 25cm, equipped with 6
> tungsten rods, each 6mm in diameter. The motor has a tacho generator on its
> shaft, which feeds a speedometer in the control box. So this gives me an
> absolutely precise measurement of both, disc speed AND bps! The meter
> reading, which has a scale from 0 - 10, is just this simple:
>
> x1000 = rpm's
> x100 = bps
>
> The rotary consists of 4 stationary electrodes, mounted to massive brass
> columns, 2 on each side of the disc,
> which results in a total of 4 spark gaps. I think, this in combination with
> the high speed / low dwell times will have some positive effects on the
> quenching properties of the gap and very low speeds will be possible
> without igniting a firewheel.
> In the video the rotary is accelerated up to 4000rpm (400bps) which is the
> target bps for my system, where the maximum power will be processed, but
> also up to 6000rpm are possible I think. Dwell time at 4000rpm is 252µs, at
> 6000rpm it's 168µs. But I should be aware of the following: Each electrode
> weights 42,736g, so at 4000rpm it's weight rises to 86,7kg, at 6000rpm
> already
> 195,1kg! At the moment I'm happy with 400bps, maybe I shouldn't try more
> rpm's with that calculations in mind :-)))
>
> The 3-phase motor variac can also be controlled with the control-box,
> voltage can be cranked up and down automatically and stopped at every
> voltage.
>
> Regards,
> Stefan
>
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