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Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I've found that larger than resonant capacitor value usually works better, with resonant value the arcs tend to extinguish too soon, drawing them out quickly helps and they make a funny sound before going out. With a bit bigger cap the arc length increases, but a too big cap decreases the resonant rise too much, the arcs are short and very hot as are the transformers after a few seconds.
Registered Member #2628
Joined: Fri Jan 15 2010, 12:23AM
Location:
Posts: 627
well that makes sence, I would assume that the arcs will throw the system out of tune,
so this reminds me of steve McConner's tesla coil page
quote:
The secret is to mistune the coil to start with. Then the streamer load will pull it into tune! I found that as I tuned my primary lower, the sparks just got bigger and bigger, until suddenly they disappeared altogether. What happened was that the coil got so badly out of tune that it wouldn't even break out, so there were no streamers to pull it into tune.
unqoute:
so this might also apply to MOTs, start it intentionally mistuned, and the arcs will tune it to that near perfect resonance.
Registered Member #2325
Joined: Sat Aug 29 2009, 10:08PM
Location: Southern California
Posts: 11
Dr. Kilovolt wrote ...
I've found that larger than resonant capacitor value usually works better, with resonant value the arcs tend to extinguish too soon, drawing them out quickly helps and they make a funny sound before going out. With a bit bigger cap the arc length increases, but a too big cap decreases the resonant rise too much, the arcs are short and very hot as are the transformers after a few seconds.
Hmm, thanks for the advice, I'll have to experiment using various capacitor values. Anyhow, your videos inspired me to do something like this ;P - I still cannot believe the size of the discharges you get with only two transformers!
Here's a video of some arcing with the stack in near resonance: (YouTube) I didn't really have that much time to film this, but I'll post some more videos up soon. The arc discharges are about 5.8' long stretched out. Quite scary, if you think about it. D:
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
"so this might also apply to MOTs, start it intentionally mistuned, and the arcs will tune it to that near perfect resonance."
quote from gatedbreakdown-This goes back to the action of a switch in interrupting a current: When the arc is the conjugate on the source maximum energy will in the arc. If the arc tunes, it implies it not soley resistive in nature, and most arcs exhibit negative resistance which supports oscillation, and not necessarily at the 60Hz drive frequency. You can hear these arcs on radio bands, modulated by the 60 Hz. The load on the MOT changes the inductance as it saturates.
Even with a DC arc, maximum power transfer, sans the j component, happens when arc = internal resistance of source. And you can hear these arcs too on a radio.
You can hear arcs on radio bands, modulated by the 60 Hz.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Kyle wrote ...
Here's a video of some arcing with the stack in near resonance: (YouTube) I didn't really have that much time to film this, but I'll post some more videos up soon. The arc discharges are about 5.8' long stretched out. Quite scary, if you think about it. D:
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Determining Inductance of a MOT Stack
