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Another coil question
By TheCasualTraveler, Section Newbies Posted on Sat Jan 19th, 2008 at 03:23:56 AM MST
calculating the area of a cross section of coil

I'm wondering, has anyone a formula for figuring the area of a cross section of a coil based on number of turns of a specific wire size? In other words as an example: A cross section of the windings of a coil using #?? AWG wire times X ??# of turns would fill a space 1/2 inch by 3/8 inch. Hope the diagram below comes thru intact. I hate to waste wire on test coils if I can calculate this fairly close.
__
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1/2 " OOOOO
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__ OOOOO
| 3/8" |

Another coil question | 6 comments (6 topical, 0 editorial)

Re: Another coil question (3.00 / 0) (#1)
by Flux on Sat Jan 19th, 2008 at 01:39:26 AM MST
(User Info)

Not easy. Best that I can offer you is that you should be able to use 60% of the calculated area. Much depends on the type of coil, size of wire and your skill.

If you are not using a tried design with specified turns and wire size then you will need to experiment a bit. It's not worth spending days on each coil to gain an extra couple of turns.

Flux

Re: Another coil question (3.00 / 0) (#2)
by TheCasualTraveler (a.miklos@yahoo.com) on Sat Jan 19th, 2008 at 04:54:04 AM MST
(User Info) http://thecasualtraveler.com/wind.htm

Good enough. If I know the size of the wire I can figure the area for 1 wire x number of turns, divide by 60 then multiply by 100 and have an approx. area. Sound right?
Andy

Re: Another coil question (3.00 / 0) (#3)
by Flux on Sat Jan 19th, 2008 at 06:05:21 AM MST
(User Info)

Yes that would be a good starting point for average winding.

Flux

[ Parent ]

Re: Another coil question (3.00 / 0) (#4)
by TheCasualTraveler (a.miklos@yahoo.com) on Sat Jan 19th, 2008 at 06:09:01 AM MST
(User Info) http://thecasualtraveler.com/wind.htm

Thanks Flux.
Andy

Re: Another coil question (3.00 / 0) (#5)
by TheCasualTraveler (a.miklos@yahoo.com) on Sat Jan 19th, 2008 at 06:12:36 AM MST
(User Info) http://thecasualtraveler.com/wind.htm

So I go to look up wire size and come up with this web page. Cool.
http://www.mogami.com/e/cad/wire-gauge.html
Andy

Re: Another coil question (3.00 / 0) (#6)
by finnsawyer on Sat Jan 19th, 2008 at 08:38:20 AM MST
(User Info)

Depends how fussy you want to get. Place each cross section of wire in the smallest hexagonal cell it can fit in. Put all the cells together in the most compact way possible like a honeycomb. That's called "Hexagonal Close Packing" and is the densest way you can fit the wires. You run into problems at the end of the layers as you indicated. One layer would have ten turns, the next nine, then ten, and so on. A machine might be able to achieve this density of packing, but it's unlikely you could do it free hand.
GeoM

Another coil question | 6 comments (6 topical, 0 editorial)

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