Author Topic: Top Loads  (Read 2517 times)

Offline UweD

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Top Loads
« on: April 10, 2017, 12:08:58 PM »
Dear All,
First off, thank you Mads for creating this forum.

My question is related to Tesla Coil Top Loads and in particular Toroidal Top loads.

Mads has a good overview of the different types of top loads relating to DRSSTC's so if you haven't read this, i recommend you do. http://kaizerpowerelectronics.dk/tesla-coils/drsstc-design-guide/topload/

For most makers of tesla coils the topload is probably one of the most difficult parts to make. This leads to a lot of creative designs which is definitely a good thing.

Currently the most made topload is probably the skeleton-design as this can be quite easily made by the amateur. If you have a bigger budget or experience with metal forcing, spun aluminium toroids come to play.

So now the question, which gives better performance?

In my experience skeleton-designs suffer from more corona losses than spun toroids. Do any of you have the same observation?

I look forward to your replies.
U.

Offline Uspring

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Re: Top Loads
« Reply #1 on: April 10, 2017, 05:34:25 PM »
You will get some corona from a breakout point in any case and you should be using one for DRSSTCs. So corona is more or less unavoidable. In my experience, that is not a problem wrt performance.
I've once worked with a toroid made from a too small diameter (6mm) copper tube. I scrapped it, since it lead to arcs coming out of the bottom part of the toroid hitting my primary. A spun toroid helped there. There is a lot of nicely working toroids out there made from (thick enough) tubing.


Offline Mads Barnkob

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Re: Top Loads
« Reply #2 on: April 10, 2017, 09:02:09 PM »
Welcome to the forums Uwe

In terms of performance, I have not seen much difference from stacking random items on top compared to perfect round surfaces, spark length(performance) pretty much lies with the capacitance alone.

The biggest issue is field shaping and trying to control where the spark channel goes. The larger and more powerful a Tesla coil is, the more you are interested in having the spark travel outwards from the coil before going towards ground. There is not much fun in a Tesla coil that can make 4 meter sparks, but will always shoot straight to ground from its 3 meter in the air break out point :)

Field shaping also help protect the primary circuit/control electronics from strikes.

Skeleton topload, even my own, lack the last inner rings, that a toroid "have" in its smooth surface, I think it is vital to remember to make that last inner ring for shielding the top of the secondary windings even better, but not really something that has been an issue for me yet.

I agree with Uspring that the large diameter tubing you are using, the more it looks like a smooth surface, I have seen some FEMM simulations of toroid vs. rings before, but I can not find them right now.
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Re: Top Loads
« Reply #2 on: April 10, 2017, 09:02:09 PM »

 


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