EEVblog Electronics Community Forum
Electronics => Projects, Designs, and Technical Stuff => Topic started by: T3sl4co1l on September 20, 2022, 10:55:02 pm
-
Neat, there's a paper on it:
http://inductor.thayerschool.org/papers/stranded.pdf (http://inductor.thayerschool.org/papers/stranded.pdf)
I always figured it'd be good for ballpark 10-20% reduction in AC resistance (at frequencies where solid wire suffers skin/proximity effect losses); seems it can do quite a bit more than that, actually!
Mind, the difference, relative to ideal litz cable, is a factor of 5 or more (or, including arbitrarily deep proximity effect, and eddy currents from fringing fields, the sky's the limit..), but compared to solid -- it's something!
Probably a 10-20% figure is still ballpark reasonable for random hookup wire, that you don't have control over strand size/count and twist pitch; and in any case, you have the rather severe problem of wasted space due to thick plastic insulation. But on a pound-for-pound basis, say on cores where you're not space limited -- relatively oversized cores, toroids -- that can be less of an issue.
Tim
-
well you can actually crimp it properly without crazy stuff so thats something
-
I read this idea and tried it. Yes, it gave me an increase of 15 mm in range. With some tuning, thicker wire, some lower impedance I may get some more range. I am not familiar with the black magic of coils, this spoils a lot of wire, so I am not worthy of Litze wire at this moment.
Thanks!