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There must be some reason why people braid Litz wire. It obviously wastes window area and increases conductor length and adds cost, so there must be a compensating payoff.
Some of the stuff sold as "Litz wire" is just loosely twisted, not braided.
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You could measure the power by guesstimating the heat capacity and measuring temperature rise. You've got the convection loss to the air.... Maybe a replacement technique. Measure the temperature at full power. Then turn it off and add a heater to the transformer and see how much power you need to get it to the same temperature.
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The stuff we use is just a seven strand twisted bundle. But this is for a 2-3kHz NMR pickup coil.
George H.
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Litz wire is sort of nice in a retro kind of way, and the braiding at least makes it easy to handle without its getting the frizzes. My first choice would be tape, as in Joerg's example, followed by Litz wire, followed by insulated multifilar, followed by solid.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs (atsign) electrooptical (period) net http://electrooptical.net
You might try pounding the tube flat and then re-annealing it before winding. That should help a fair amount.
The coupling to nearby objects might be partly the solenoidal field--ordinary toroids essentially have a one-turn solenoid in series with the toroid, due to all the windings going the same direction. Splitting the winding into two counter-wound segments can really help, and of course that reduces the leakage inductance in the process.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs (atsign) electrooptical (period) net http://electrooptical.net
Not hard to do, I just need the thermometer.
It's tubing for a reason, it's got water through it. Measure inlet temp, measure outlet temp, measure water velocity, done. :-)
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
Gack, choke! That'll make things a *lot* worse -- it'll go from water cooled and inefficient, to slightly more efficient, and melting :-o
There are two solenoidal fields-- the primary "around" the toroid, which is only 1 turn at 50A, and the secondary through it, which is 2 turns at
500A. The secondary isn't symmetrically "through" it, so it makes a big solenoid field sort-of-tangent to one side of the core. Here's a picture for reference:Winding copper tubing through stacked toroids is an interesting process.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
Use Litz Tubing.
Hey, seriously, run teflon or some such tubing with Litz or welding wire inside, and run water through it.
John
"John Larkin" wrote in message news: snipped-for-privacy@4ax.com...
I think that's what they must do for those flexible induction cables (e.g., like used on the Mythbusters popcorn show). Must be ridiculously expensive to buy new.
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
Well, you just need some slightly more refractory copper. ;)
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs (atsign) electrooptical (period) net http://electrooptical.net
Refractory copper. There's a cute self-contradiction. :)
Jon
Just try running a red light in front of a police car. You'll find the coppers very refractory indeed.
Cheers
Phil Hobbs
-- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 email: hobbs (atsign) electrooptical (period) net http://electrooptical.net
You mean the tungsten-filled stuff?
...Yes, "refractory copper" actually exists. ;-)
Tim
-- Deep Friar: a very philosophical monk. Website: http://webpages.charter.net/dawill/tmoranwms
He should quit whining and use platinum.
John
Too high a resisttivity, how 'bout refrectory silver, costs less, less resistive.
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