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I have started building a new SGTC which when complete will be a little different to most of the other SGTCs out there. I have already made some progress constructing it and will post some photos in the next post.
I built a 10kW pig powered coil in 2001, but unfortunately it rarely got used because outside operation was a must, requiring significant effort to be invested just to see it run. Also, running outside can be a bit hit and miss, especially in a breeze. Furthermore, pulling over 40A from a 240V single phase line is not looked upon very favourably in Australia.
Fast forward nearly 15 years and I'm all grown up, or at least have my own place and shed. So now it's time to build a new coil with the following criteria:
1) It can fully utilise my shed space and perhaps still put on a good show if I can be bothered to move it outside one night.
2) It will run from 3 phase power, at about 5kW and pulling under 10A from each phase.
3) It will employ DC resonant charging.
Below is a photo of my shed space. I am severely limited in an upwards direction, but as you can see the floor space is quite large (3 car bays wide). Maybe with a horizontal breakout point I could get some decent sparks....
Today I wound the Primary. I chose 10 turns, partly for aesthetic reasons and partly because that's all I could get from a standard 18m roll of tubing. It's in 12.7mm (1/2") tube and has been set up for an 8" secondary with the inside winding at 12" diameter. The supports are 1/2" polycarbonate (lexan) Just need to add a strike rail now...mounting holes are already drilled
Unfortunately my iphone camera is having a bit of a fisheye effect which makes the primary look far more out of round than it actually is!
Well, I'm going to try something a little different for my ASRSG. I like big decent RSGs that once built last a lifetime and can be used on any future coils, big or small. Perhaps even a magnifier I have planned.
I will run a 12" diameter disk with 8 rotating electrodes, probably simply 10mm threaded rod. With electrodes this thick the dwell time will be high, but hopefully it will be adequately low if my charging reactor is large enough.
I wanted a decent quality DC or universal motor in the 1/2 - 1HP range. Unfortunately they're damn expensive.
Instead, for half the price I've obtained a new 1HP 3000RPM 3 phase motor with a single phase to three phase inverter with full speed control. It can run from 0 to 6000RPM, perhaps even higher, though I wouldn't want to try. The inverter simply varies the output frequency and the motor locks on to it, hence varying the speed. It can also run backwards and the spool up and down times can be varied.
Torque below 500RPM is pretty poor, but I won't be running below 1000. With 8 rotating electrodes we are looking at break rates of 133-800 BPS.
I'm going to have to find a way to shield the speed controller and motor and feed lines to prevent RFI...
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Build Thread for My New 3-Phase DC Resonant Charged SGTC
