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Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I made a kind of round jacobs ladder today. It uses a few simple parts and delivers some HV eyecandy. So heres the guts; 7.4kv 10ma electronic (GFCI) NST Magnetron magnets 2x 12awg wire rings 30x 1kv 1A diodes (I had the string laying around)
The speed of the arc can be controlled by the strength of the magnetic field (more magnets or closer magnets makes the arc spin faster.) The rings don't have to be perfectly round for this to work but it helps a lot if they are. My next step is to go bigger.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Very nice!
I wonder what it would take to make a large scaled one... Perhaps it would be easiest to use a big loop of wire and use that as the source of the agnetic field? As a bonus you could also vary the voltage to the coil and adjsut the speed
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I was thinking of making a large ring around a point electrode and powering it with my (rectified) mots. For a magnetic field I would lay out as many magnetron magnets as I have.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Awesome Nik! It would be cool to scale that up a few times. How slow can you make the arc go/ what happens with the magnet at a larger distance?
Jmartis, that works too. I've been wanting to try it with resonant MOT stack, but I just haven't had the time. Here's a picture from my offline driver.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
I got it to go a little less then 1 revolution per second, after that it gets a little jumpy and likes to stick in one place. The distance between the magnet and the arc changes the speed of the arc. I did not use one of the magnets as an electrode because I have already broken a few magnets from rapid heating and cooling ( arcs and microwaves :-S ).
The only limit to using mots (that I can see) is getting a magnet or magnetic field close enough to the electrodes that is big enough to make the arc rotate. The upside down V shape that mot arcs like to make makes me think that its own magnetic field might be too far from the static field to be any use.
After saying all of that, it never hurts to try. Maybe I will be wrong and it will be a booming, wizzing arcing success.
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HV "Pinwheel", round jacobs ladder
