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Registered Member #914
Joined: Fri Jul 20 2007, 06:22PM
Location: South Bend, IN
Posts: 85
You can make a choke without a core also. I have two 20mh chokes on my MIDI coils that are just made from 14 AWG wound (approx. 500ft) on a plastic spool.
The inductive reactance XL = 2 *PI* f* L So, at 60 Hz with 20mH XL = 7.54 ohms
Registered Member #477
Joined: Tue Jun 20 2006, 11:51PM
Location: Seattle, WA
Posts: 546
Capper wrote ...
You can make a choke without a core also. I have two 20mh chokes on my MIDI coils that are just made from 14 AWG wound (approx. 500ft) on a plastic spool.
The inductive reactance XL = 2 *PI* f* L So, at 60 Hz with 20mH XL = 7.54 ohms
At 120 VAC that limits each coil to about 16A.
Scott
The 500ft-spool-of-wire trick does work, but you're definitely better off with a laminated or bundle-of-wire core, not just because you can move it to adjust the current, but because it means using a lot fewer turns to achieve the desired inductance, and hence a lot less wire (less DC resistance). I once played with using two 500ft spools of #10 in series with a 15kVA pig. Applied 240V and was pushing about 40A. The spools of wire together had about 1.5 Ohms DC resistance, though, so as you can imagine things heated up real quick!
My actual coiling projects have tended to stick around the 1-3kVA level, and for this I've just used a 120V 45A Luxtrol variac. Unmodified, it'll pass about 30A with 1/3 the windings engaged. Never had any surprises with it, and it's absurdly convenient. I bought it off a local guy for $80. Seemed hard to beat.
Registered Member #599
Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624
I did some tests with old transformer core and now i got what i wanted :)
This is very rough prototype:
Tomorrow i will rewind it with 2x wires in parallel like my first ballast was done. Now it has 105 turns of AWG12 wire and ¨I¨ removed current is about 25A and 'I' completely in place current is 0.2A. I will make final winding so that maximum current is around 80A (I removed)
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Made 'slide chocke ballast' - what im doing wrong here?
