Litz wire
in [Design]
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From: jcdrisc on 19 Feb 2010 20:39 On Feb 20, 6:21 am, "Tim Williams" <tmoran...(a)charter.net> wrote: > Who sells this stuff (without paying for miles at a time)? > > I'm especially interested in stupid thick stuff, like, as large as 8AWG > equivalent. Nebraska Surplus for instance doesn't stock wire like this.. > > Tim > > -- > Deep Friar: a very philosophical monk. > Website:http://webpages.charter.net/dawill/tmoranwms I doubt you would find such a heavy gauge. The litz wire I have used I recovered from IF transformers in old radios. I have never found a commercial seller and doubt whether anyone would still make it jcdrisc
From: John Larkin on 19 Feb 2010 20:57 On Fri, 19 Feb 2010 13:21:36 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: >Who sells this stuff (without paying for miles at a time)? > >I'm especially interested in stupid thick stuff, like, as large as 8AWG >equivalent. Nebraska Surplus for instance doesn't stock wire like this. > >Tim I've seen power inductors wound from a bundle of smaller-gage enameled wires just bunched together in parallel and gang soldered on the ends, but not woven like proper Litz. That apparently cuts eddy currents a bunch. MWS sells this style too, a bunch strands of smallish wire loosely twisted together, with thermal-strip insulation. John
From: Tim Williams on 19 Feb 2010 21:46 "jcdrisc" <jcdrisc(a)melbpc.org.au> wrote in message news:b747a6b1-81bf-4323-af20-8dd9b26b0eb8(a)q2g2000pre.googlegroups.com... > I doubt you would find such a heavy gauge. > The litz wire I have used I recovered from IF transformers in old > radios. Well, I've got the rope stuff I mentioned earlier, and I've taken apart Sony transformers (which were wax impregnated, not varnished!) which used litz. Just a twisted bundle, not properly woven, but I'm not that picky. Tim -- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
From: Spehro Pefhany on 19 Feb 2010 22:09 On Fri, 19 Feb 2010 13:21:36 -0600, the renowned "Tim Williams" <tmoranwms(a)charter.net> wrote: >Who sells this stuff (without paying for miles at a time)? > >I'm especially interested in stupid thick stuff, like, as large as 8AWG >equivalent. Nebraska Surplus for instance doesn't stock wire like this. > >Tim I did a web search last week for some for a power converter transformer. 600+ strands of AWG 46 wire for something like $1/foot in small quantities. You could braid about five of those together.. (I'm sure you can find it as easily as I can). Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff(a)interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
From: George Herold on 19 Feb 2010 22:23
On Feb 19, 5:18 pm, "Tim Williams" <tmoran...(a)charter.net> wrote: > "George Herold" <ggher...(a)gmail.com> wrote in message > > news:550831a9-5935-4e3d-b37e-c664ebd9d752(a)o3g2000yqb.googlegroups.com... > > > We get Litz wire from MWS but nothing that big. If you don't need > > that much have you thought of 'rolling your own'? > > I do sometimes, but only for small things. I'm contemplating 10A at 1MHz, > so it needs to be pretty fine = way more strands than I'd want to deal with. > > I actually have some copper rope, which is about 1/4" diameter and looks to > be made of 28AWG or so. I don't remember how many strands it is, but if I > guess the rope is wound from 7 strands of 31 strand twist, that's 7*31 = > 217. If 28AWG is good for ~200mA, 217 strands should be good for 40A, which > sounds about right, I'd call it 8 or 10AWG equivalent. I salvaged this > stuff from some old motor driver, which used a spool of this stuff for > air-core inductors. > > Tim > > -- > Deep Friar: a very philosophical monk. > Website:http://webpages.charter.net/dawill/tmoranwms The copper rope is not long enough? We've got some discard litz wire, but not nearly that thin or as many strands. We use it to make high Q coils to detect the nuclear magnetic moments of protons spinning in the Earth's B field. Frequencies a bit above 2kHz. And lots smaller currents. Well the same coils polarize the spins, but that's 3 amps at DC. George H. |