Thread-topic: Pole Transformer Coil Design Guidance
Hello Amir,
A 40 amp current draw will be a significant coil. The "optimum" capacitance is one that is fully charged at the end of each RSG break. "Optimum" in this sense means that you will be fully charging the capacitor. Of coarse it will work fine if not fully charged, you just will not be achieving maximum streamer length. There is no optimum secondary diameter as far as I know. What you do want is an aspect ratio (length/diameter) of 3 to 5 for the secondary coil. Use JAVATC to try different parameters. One of the outputs of JAVATC is capacitor charge at the end of each RSG break. You can never achieve 100% charge because that would theoretically take an infinite amount of time so I would shoot for 95% charge. Use whatever maximum current that is available to achieve that. I use a 3x voltage derating for my Maxwell capacitors just for reliability. My 6.5 KVA pole transformer-powered coil has been operating for 5 years with no problem.
----- Original Message -----
From: "Tesla Coil List" <tcml@xxxxxxxxxxxxxxx>
To: "Tesla Coil List" <tcml@xxxxxxxxxxxxxxx>
Cc: "Amir Mojarradi" <amojarradi@xxxxxx>
Sent: Monday, September 4, 2023 1:11:06 PM
Subject: [TCML] Pole Transformer Coil Design Guidance
Hi all,
I was wondering if I could ask for guidance on a Tesla coil I am working on - I want to make the smallest Tesla coil (primary and secondary) with the supplies I have:
- 10kVA pole transformer (240V/14400V)
- a Lincoln Arc Welder (as a current-limiting ballast for the pole transformer)
- (2) 0.22uf 50kv Maxwell capacitors (could be in series for 0.11uf)
- (2) 0.03uf, 35kv Maxwell capacitors (could be in parallel for 0.06uf)
- Copper Tube Gap Spark Gap
- Async Rotary Spark Gap w/ Black and Decker Motor
If I run the pole transformer with the current-limiting welder set to the lowest setting (ie, 40A), what would be the optimal tank capacitance value to use?
Also, on the lowest setting of the welder, what would be the advised minimum diameter for a secondary coil (ie, would a “4 inch secondary be too small?) and the minimum thickness of a primary coil (ie, would 1/4” copper tubing be too thin)?
Any suggestions or guidance would be greatly appreciated!
Will report back with photos as I progress!
Thanks!
Amir
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