On 3 Apr 2007 09:12:55 -0700, "Tim Shoppa" <
[email protected]>
wrote:
[snip]
Not so hard... Google for "Laminax", there are places that sell it on
the net. There are other brands but I just happened to have the Alpha-
Core catalog on my desk! Also (IIRC) available with two parallel
conductors for bifiliar-type applications.
Alphacore also has toroid winding machines... and audio-fool class
cables...
Tim.
Found it:
http://www.alphacoredirect.com/index.html?lang=en-us&target=d4.html
I seeee shopping carts!!! That's a good sign..
So...I'll add it to the list....
So many choices for low DC conductivity and flexibility...
Flat wire
Thin insulated bundle of bare stranded wire
Litz wire (woven)
Pseudo litz (insulated strands)
The Litz is probably the most versatile in that any leftovers are also
good for high frequency inductors.
Pseudo litz is good. I can get any DC conductivity by increasing
strands. If needed, the strand gauge can be selected for low AC (skin)
resistance.
Thin insulated bundle of bare stranded wire (like hook up wire) is
something I have to Google up..This should be the least expensive.
Flat Wire
Say I want #12 conductivity. Let's say it's too stiff to wind.
Equivalent to #12 Alpha core flat wire has a 1:2 ratio
...(thickness:width)
I'll guess it's like winding with ____ AWG.
I couldn't find the wire height on the Alpha site!!!...
...math hurts...
Laminax
Well..I wish there was some app notes on the Alpha Core site.
Toroid pictures would be nice..
I might do a construction trial winding a strip of plastic on a
toroid.
Winding with a 0.5" strip on a 1" ID 1.3" OD toroid just doesn't seem
physically right..
Also, I have to do the DC conductivity math for 0.01"x0.5" copper (per
1000ft)
I did some reading on:
http://www.dartmouth.edu/~sullivan/litzwire/skin.html
"proximity-effect losses typically dominate over skin-effect "
However my inductor design has a Idc^2 to Iac^2 ratio = 98@100khz...
So that's why I'm favoring wire conductivity over wire structure.
And also the proximity effect calculation looks painful..
D from BC