Author Topic: Drsstc 3  (Read 4474 times)

Offline oneKone

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Re: Drsstc 3
« Reply #40 on: February 28, 2019, 11:21:25 AM »
time to get started on this project again!

in the time since i last posted i haven't achieved much. the bridge and the mmc are pretty much completed with some minor tweaks needed.

For the bridge i ended up using 8mm aluminium plate for the bus bars which has an added bonus of making the assembly more rigid, although i don't know if its a wise decision to be relying on the terminals of the bricks to take the load of the capacitors?  As for the mmc it was pretty simple. 3mm x 15mm coper flat bar was used along with m6 cap heads to keep everything in place.



« Last Edit: February 28, 2019, 11:23:00 AM by oneKone »

Offline oneKone

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Re: Drsstc 3
« Reply #41 on: April 10, 2019, 01:45:25 AM »
For about a month now I've been put off on this project, I really couldn't be bothered making any progress and I couldn't figure out why..... Then it hit me! I hate the look of it 😢

Basically I had a 450x450x350mm "cube" for the base of the coil, to me that's pretty unappealing. One look I do like are round bases both a helical primary. Apart from Mads drsstc 1 I haven't really seen bigger drsstc with helical primaries at all, unless having a pancake primary was more of the norm 5-10 years ago?

So my question is, are there any drawbacks from having a helical primary at this size I can't think of?

Offline Mads Barnkob

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Re: Drsstc 3
« Reply #42 on: April 10, 2019, 09:13:24 AM »
For about a month now I've been put off on this project, I really couldn't be bothered making any progress and I couldn't figure out why..... Then it hit me! I hate the look of it 😢

Basically I had a 450x450x350mm "cube" for the base of the coil, to me that's pretty unappealing. One look I do like are round bases both a helical primary. Apart from Mads drsstc 1 I haven't really seen bigger drsstc with helical primaries at all, unless having a pancake primary was more of the norm 5-10 years ago?

So my question is, are there any drawbacks from having a helical primary at this size I can't think of?

Good old Dr. Spark, which seems to have closed down his website, primarily built helical primary coils and they performed great!

Now I built a helical coil on my first DRSSTC for several reasons:
- To make the coil take up less space, smaller diameter
- I thought it was easier to make primary coil holders for this type compared to spiral
- Tapping was easier with cable just going up the side

I will avoid helical coils in the future for the following reasons:
- It has a high coupling that is harder to adjust/control
- It is much closer to the topload, so there is more strikes to ground rail
- It was a pain to wind the coil through the 4 sheets with too small holes, it took me hours to move it centimeters at a time as it kept locking itself in place
- There is no performance gain over spiral, for a DRSSTC

I would however still make round platforms with spiral primary coils, as I think they look great, but when you get up in size you really need a bigger base to stabilize the thing with wheels out in the corners of a box.

You could also go inbetween spiral and helical and make a upsidedown U shape primary if you want it to have a smaller diameter overall.

Looking forward to see what you decide on :)
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

Offline oneKone

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Re: Drsstc 3
« Reply #43 on: April 10, 2019, 09:49:46 AM »
Cheers for the guidance Mads. Is having a upsidedown U primary the same calculation as a flat pancake?  I had a quick look at your drsstc that uses one, looks extremely nice.

Offline Mads Barnkob

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Re: Drsstc 3
« Reply #44 on: April 10, 2019, 12:21:20 PM »
Cheers for the guidance Mads. Is having a upsidedown U primary the same calculation as a flat pancake?  I had a quick look at your drsstc that uses one, looks extremely nice.

I think I just went with a median value based on spiral coil and coupling as if it was a helical, but as you can see from the article on my website, I did a lot of measurements instead, as I could not calculate its specifications.

I guess you have to use something like FEMM in order to get a correct simulation as spiral/helical calculators and javatc does not support that primary form.
http://www.kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics

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Re: Drsstc 3
« Reply #44 on: April 10, 2019, 12:21:20 PM »

 


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