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Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
Hey. I am working on the design of my new drsstc which has a bit of hardware needed near the primary. For an overhead I will say that the material has to withstand being directly in the center of a primary coil cycling up to and maybe a bit more than 1kA. Most of the stuff is going to be machined using teflon and polypropaline, but for some parts that need to be heavily load bearing I require a type of metal. I think that brass, copper or aluminum would be the best choice as copper has a low resistance and all are mostly non magnetic. The downsides are that brass is hard to machine and copper is massively expensive for thing like barstock. Aluminum might end up the material of choice, but I want to hear what you guys think about the non magnetic type of stainless steel for the parts that I can't machine.
Any finding backed with some ih testing are certainly welcome!
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
I think aluminium should be fine, after all we make spun toroids out of it, and my last DRSSTC was built on a 1/4" thick piece of checker plate. Non-magnetic stainless would be a good choice for the fasteners.
Try to avoid complete loops of metal close to the primary, for instance if you have a circular frame, put a gap in it to avoid creating a shorted turn. If the shorted turn is made out of a good conducting material, it won't necessarily dissipate a lot of power, but it will shift the tuning of your coil away from what the simulators predict.
I've always got by with HDPE, wood, and nylon nuts and screws.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
Yep, nylon screws are my new favorite. I use them as workpiece fasteners on my Cnc machine so that if my programming is slightly off I don't snap the bit. All the parts I am going to be making will be from Teflon or poly, because I have a sheet of Teflon and poly is cheap for barstock. What I am mostly looking for is a non magnetic screwshaft. Honestly I can't tell the difference between the magnetic and non magnetic ss materials, should I just go to the hardware store with a magnet?
As you might have guessed this is going to be a work inspired by Finn Hammer and Daniel Uhrenholt's systems with realtime K adjustment. Just no rt primary tapping because a spiral coil won't change it's center of inductance(I made that up ) when the tap point is moved. I will end up putting it in the project thread when I finish designing the system.
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Eddie resistant materials
Non-magnetic stainless would be a good choice for the fasteners.