Re: A Way to Use Bare Wire on a Toroid

On Wed, 02 May 2007 22:01:50 GMT, the renowned Rich Grise
<rich@xxxxxxxxxxx> wrote:

On Wed, 02 May 2007 17:16:26 +0000, D from BC wrote:
On Wed, 02 May 2007 16:55:55 GMT, Robert Baer
D from BC wrote:
On Wed, 02 May 2007 07:14:23 GMT, Robert Baer
Martin Riddle wrote:
"John Larkin" <jjlarkin@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
On Tue, 01 May 2007 18:46:07 GMT, D from BC <myrealaddress@xxxxxxxxx>

I got a chuckle when I saw this..

Wire guides on a toroid..
Patent 4975672
http://www.google.com/patents?id=hIcoAAAAEBAJ&dq=4975672

OMG, NASA wastes our tax dollars again. This is *radically* stupid.

McLynm or whatever is the author of a few books on magnetics. Sort of
cookbookish.

1) You are a little late to be harping; the date of the patent is 1990.
2) *NOTHING* in the claims states bare wire; in fact it eXplicity (ie:
X-rated) states *Litz* wire.
3) Learn how to read.

I didn't the read patent. :)
Patents often have that pseudo english patentese that I don't like
reading.
What?? No claim of using bare wire in the patent???. :)
I just looked at the diagram and used my imagination...
The wire guide really looks useful to keep windings from shorting out
with bare wire..
Litz wire makes sense for HF use.

Yea; the guide idea *seems* good, but the expense of making guide
grooves methinks exceeds the expense of putting insulation (eg: enamel
or polyurethane) on wire.

The worst is the CAD time to make the guide.

A circle with notches? Five minutes, tops.

The die (female part) for punching it would probably look something
like this (looking into the bottom, from where the part falls out)

http://server2.hostingplex.com/~zstoretr/die.jpg

Of course, then somebody has to actually physically make the things;
a one-off would be about $60.00 in a real shop, and a stamping
die/injection mold would be about $50,000.00,

Nah, the punch/die can be made with wire-cut EDM, provided the inside
radii are kept to a reasonable value (design issue). Cheap.

but the guides would be
probably less than $0.01 each.

Cheers!
Rich


Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
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