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Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
how about taking a copper strip like these, soldering a thick wire to each end (parallel to the width, perpendicular to the length,) give the strip a wrap with electrical tape for insulation, and coil the strip about one of the ends to make a coil with a small circular area while maintaining high current capability?
-edit: reason: i've been wanting to come up with a way of inductively launching pre 1982 U.S. copper pennies
Registered Member #1526
Joined: Mon Jun 09 2008, 12:56AM
Location: UK
Posts: 216
If you mean what I think you mean then it`ll work great. In fact I believe the first drsstc had a primary like that although I`m sure he`ll tell you himself :o)
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
Excellent idea. The pancake-coil design is very good at coupling inductively with flat round objects like pennies or flat aluminum disks. The 7KJ Discovery Channel coilgun was built precisely this way, although they call it a spiral coil.
Registered Member #1917
Joined: Fri Jan 09 2009, 02:38AM
Location:
Posts: 62
Even with coils made of normal magnet wire, this works very well for launching copper coins. Last winter I was hitting about 400m/s with quarters from a 5kJ input pulse (destroyed the coils though...)
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
I was thinking about making a high power launcher this way except using some sort of plastic for insulation since I'd trust that more. It would also be able to withstand high voltages so some pretty fast pulses could be put through the coil. At really high energies, I'd have to be careful of the coil squishing itself together though the plastic. I'm not sure that's the only force I'd need to be careful of though since the coil itself would try to expand since current is traveling in the opposite direction on the other side of the coil.
Registered Member #3888
Joined: Sun May 15 2011, 09:50PM
Location: Erie, PA
Posts: 649
yea with the greater surface areas facing each other i'm sure it would have to be reinforced a bit. make the spiral and then force some epoxy putty down into it maybe? my hope was that this kind of design might not explode every time it is fired, and that it could have a small circular surface area.
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
How much copper does the coil require to hold itself together? I don't know but I can offer one sample point ... The Discovery Channel coilgun remained intact after many firings from a 7 KJ capacitor bank. The coil was built with 2mm thick x 10 mm width copper that was wound in a spiral and annealed so it wouldn't try to unwind itself. Just sayin'.
Barry I'm trying hard to be a Type A personality, but I'm just to lazy and apathetic to do it very well.
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idea: new induction launcher coil design
