Rap 'n Tap
[ Home | Contents | Post | Reply | Next | Previous | Up ]
From: Garry Nichols
Date: 11/9/00
Time: 12:49:36 PM
Remote Name: 209.4.252.239
Thank you John. Now we appear to be getting some place (provided your "visions" are correct--you haven't been out in the desert for a while or anything have you?).
I've always considered "proximity effect" to consist solely of the effects of the wires lying side by side on a close wound coil. That is why I had trouble accepting Litz wire--you had another case of wires lying side by side. If there is more to proximity effect losses than this, then I was not aware of it. (Such as your idea of the currents being drawn to the inside surfaces of the turns by attraction.)
I did understand about the current being forced away from the sides of the wires in close spacing due to repulsion of like charges. No one so far has stepped forward to tell me if the insulation between each tiny wire in a Litz bundle or sub-bundle is thick enough to counteract repulsion and the current bunching that I suspect to be occurring because of it.
By the way, I don't in the least mind being told by anyone that I've got this all wrong! And, I know that there must be some advantage to Litz, otherwise designers would not be calling for it, and companies would not be selling it! I'm just trying to get the general idea of how it works and to estimate if it's worth using it in coils or loop crystal sets, or whether I can get about the same results with large solid conductors well spaced from each other.
I don't have the time to dig into the theory myself. I was hoping someone already knew and could relate it to me without either of us spending a lot of time on it.
Thanks again.
Garry