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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
There's the SCR, it says it can handle 500 amps peak, will this work well for a small coilgun? I have some caps that would work okay for it, 250 volt 1500 uf, and some other assorted ones. I need a charger for it, though. Hrm. Does the SCR need a good heatsink as well?
Registered Member #90
Joined: Thu Feb 09 2006, 02:44PM
Location: Seattle, Washington
Posts: 301
20 gauge wire is too thin, it has too much resistance for coilguns. Try 16ga or better yet 12ga. A coil with one or two layers of heavy wire always works better than with more layers.
I think my RLC simulator will help you come up with a coil design for your capacitors. Look for a discharge time in the range of 2 - 10 milliseconds depending on the length of your projectile.
As he said, a heat sink doesn't matter in pulsed applications. The few milliseconds of heat generated will raise the junction temperature and the energy doesn't have time to spread out to a heat sink before the discharge is over.
My suggestion is to buy an inexpensive SCR like that one (and a spare!) and try it. When you blow up the first one, you've learned something.
Cheers, Barry I can't decide whether or not I like waffles.
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I have an SCR and wonder if it would work for a small coilgun?
