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4hv.org :: Forums :: General Science and Electronics
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How to attach these caps to coil?

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Inducktion
Tue Apr 26 2011, 01:13PM Print
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I've gotten these Eurofarad capacitors, they're 3.75 uF each, at 580 V RMS and 152 AMP RMS.

They're somewhat hefty, and I need some way to connect them up to the work coil in my induction heater. I have an aluminum stock bar, and the terminals on the capacitors are aluminum with screw holes already made in them (I have the fitting screws as well).

The problem is, the coil is copper and the connecting wires to the inverter are copper. Aluminum doesn't solder, and they're also dissimilar metals. Is there any ...better way of hooking these two metals up safely? Should i just use a screw or nut/bolt type terminal to hook the coil up? Crimps?

Thanks!
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Dr. ISOTOP
Tue Apr 26 2011, 03:52PM
Dr. ISOTOP Registered Member #2919 Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
Ring terminals?
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Experimentonomen
Tue Apr 26 2011, 06:42PM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
Make tabs out of copper sheet, bend and solder around the work coil tubes, then bolt the tabs to the aluminum busbars between the two caps

Like i did here: Link2
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Inducktion
Wed Apr 27 2011, 03:14AM
Inducktion Registered Member #3637 Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
Experimentonomen wrote ...

Make tabs out of copper sheet, bend and solder around the work coil tubes, then bolt the tabs to the aluminum busbars between the two caps

Like i did here: Link2


Do you still have that Celem cap? I can't remember.

And, alright. The only issue NOW is that I need to find a copper sheet. ARGHHHMORESTUFF
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Experimentonomen
Wed Apr 27 2011, 05:19AM
Experimentonomen Registered Member #941 Joined: Sun Aug 05 2007, 10:09AM
Location: in a swedish junk pile
Posts: 497
I sold that celem cap a long time ago. Doesent the local hardware store sell some kinda copper ?
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James
Wed Apr 27 2011, 05:32PM
James Registered Member #3610 Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
I used 3/4" copper pipe that I flattened in a bench vise for the bus bars and output terminals in my CD spot welder. If you don't need something that thick, you can get copper strap for hanging pipes in the plumbing section of just about any hardware store.
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