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Registered Member #259
Joined: Sun Feb 26 2006, 05:57PM
Location: Friday Harbor, Wa
Posts: 18
I have recently built a 1000W DC-resonance coil, powered by a voltage-multiplied MOT. The design requires an inductor around 30H, and I have been using two MOTs with the secondaries connected in series, with the 'I's cut off. This works fine, but I am worried about insulation failure. Also, they are quite heavy. I would like to make my own inductor, and have a few ideas.
>Thicker wire, like 24 or 22, to allow for higher current and longer use.
>Layers insulated with HDPE
I have a problem, though. None of the cores I have are suitable for the project. I have searched online for a large ferrite C core, but cannot find any supplier. Does anyone know of any site that sells them? Thanks.
Registered Member #205
Joined: Sat Feb 18 2006, 11:59AM
Location: Skørping, Denmark
Posts: 741
You are talking about the charging reactor, I suppose.
With a toroid core, you will face even more severe insulation problems than with an ordinary E-I or U-I core. And a powdered core will not supply the inductance you need.
I understand that you want lower weight, but this is only possible to a certain point.
Since you are able to run with the MOT`s, I`d say you already have suitable cores. Removing the primary winding will accommodate thicker wire and or more insulation.
Registered Member #259
Joined: Sun Feb 26 2006, 05:57PM
Location: Friday Harbor, Wa
Posts: 18
Ah, I mean a 'U' core, not a 'C.' The design is very similar to Steve Conner's Tesla 2. http://www.teslaboys.com/Tesla05/T05Power/index.html is a coil with a homemade charging reactor using a U 100 core, but I cannot find this product anywhere...
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Laminated iron is probably better than ferrite for low-frequency applications like this. Not to mention cheaper and easier to get. I've managed to salvage a few pairs of laminated iron C-cores from old transformers.
If you use thicker wire, then the core will end up being bigger and heavier to give the same inductance, because it needs a larger winding window. If you want a more compact inductor, start with thinner wire.
Good to see my old Tesla-2 design is still doing its thing
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