Litz wire
in [Design]
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From: life imitates life on 19 Feb 2010 23:54 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 Pick a gauge, buy the mag wire, and make your own. It is not that hard at all. Properly braiding out a custom length of Litz wire is no harder that winding your own custom pot core transformer bobbin. One just has to set one's mind to it, and accomplish a simple task without assigning undue difficulty to it without even trying. Can't be any harder than macrame. You can actually come up with better stuff than you can even buy too. The stuff you refer to sounds like it would not be a cheap per foot price, even if you were buying a whole spool. Probably better to fashion a double long length, then cut it in half when you are ready to use it. What is the application , and the length of the run? Or is it needing to be long enough to be a primary winding?
From: life imitates life on 20 Feb 2010 00:14 On Fri, 19 Feb 2010 16:18:49 -0600, "Tim Williams" <tmoranwms(a)charter.net> wrote: >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. The problem is that it not being constructed from individual mag wires, it is "seen" as a single strand to the current flow, and having only ONE skin. The litz configuration requires the wire be discreet from each other with the exception of the termination points.
From: RogerN on 20 Feb 2010 00:26 "jcdrisc" <jcdrisc(a)melbpc.org.au> wrote in message news:b747a6b1-81bf-4323-af20-8dd9b26b0eb8(a)q2g2000pre.googlegroups.com... 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 I used some on a project a few years ago, it was used to induction heat studs that were inserted into plastic automotive light housings. It was heavy stuff, the induction heater only took a couple of seconds to heat the studs hot enough to melt into the plastic. I don't remember where we got it from though, found it by a google search if I remember correctly. RogerN
From: life imitates life on 20 Feb 2010 00:47 On Fri, 19 Feb 2010 16:58:13 -0600, Tim Wescott <tim(a)seemywebsite.com> wrote: >On Fri, 19 Feb 2010 16:18:49 -0600, Tim Williams wrote: > >> "George Herold" <ggherold(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 > >Isn't there some magic braiding pattern for Litz wire? No. The wire strands have to be mag wire, which segregates them from each other, allowing the skin effect to be taken advantage of. Without strand segregation, it becomes a single strand, from the POV of the current flowing in it, with only one skin for the entire mass.
From: life imitates life on 20 Feb 2010 00:53
On Fri, 19 Feb 2010 17:39:03 -0800 (PST), jcdrisc <jcdrisc(a)melbpc.org.au> wrote: >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 One can take multiple pieces of a smaller litz, and increase the effective gauge. No need to unwrap the individual segments. |