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Multi-layered Secondary HELP!!
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From: gweaver [SMTP:gweaver-at-earthlink-dot-net]
Sent: Monday, February 16, 1998 1:45 PM
To: Tesla List
Subject: Re: Multi-layered Secondary HELP!!
Your multi layer coil will work fine. Coat each coil with polyurethane and
let it dry before putting on the next layer. Make the 2nd layer 2 turns
shorter than the 1st layer. The wire on the 2nd layer will lay very nicely
between 2 wires on the 1st layer. Solder the wires together at the ends and
use one wire to the ground at the bottom and one wire at the top to the
terminal.
I made a 4.25" diameter by 13.5" long secondary coil with 2 layers of #24
wire. The 1st coil, KHZ = 575.1, uh = 11519. The 2nd coil KHz = 575.4, uh =
11506. A little different but not enought to hurt anything.
The only advantage I can see is lower wire resistance and higher Q.
I did an experement and build 3 coils each the same diameter, same length
and same wire.
1st coil is 4.25" dia x 13.5" long one layer of #24 wire. 626 turns. R = 16
ohms.
2nd coil is 4.25" dia x 13.5" long 2 layers of #24 wire one layer on top of
the other layer connected in parallel. 626 turns 1st coil and 624 turn 2nd
coil. R = 8 ohms.
3rd coil is 4.25" dia x 13.5" long #24 wire 2 wires wound side by side
connected in parallel. 313 turns each coil. R = 8 ohms.
Using the exact same power supply, spark gap, cap, primary coil, toroid,
etc. I tested each secondary coil one at a time. The 1st coil produces 13"
sparks, 2nd coil produces 14" sparks and the 3rd coil produces 12.5" sparks.
Multi layers seem to be better but not very much.
Gary Weaver
At 07:56 PM 2/15/98 -0600, you wrote:
>
>----------
>From: Zuma [SMTP:mwise-at-ns.sosis-dot-com]
>Sent: Sunday, February 15, 1998 1:58 AM
>To: tesla-at-pupman-dot-com
>Subject: Multi-layered Secondary HELP!!
>
>I am considering making a very small portable tesla coil. But before I
>do this I need to clear up how I am going to wind the secondary. First
>of all I am planning on making a secondary coil with these demensions,
>3.25"o.d. x 9.75"height giving it a 3:1 ratio. I know this sounds way
>too small but hear me out. I want to make a multi layered secondary,
>basically to increase the pf, mh and lower the frequency. I want to have
>three layers to the coil, but I don't know if the windings have to be
>three seperate windings wound one on top of the other or if it needs to
>be one continuous winding. I would think that having a continuous
>winding would be what I need, but I want to make sure before I biuld it.
>I also would like to know how well the magnet wire would hold up to
>having that many windings over each other, it seems like it would put a
>voltage strain between the windings. I was planning on insulating each
>of the windings with about 2 layers of polyethylene tape or high
>dielectric strength electrical tape. The winding I am considering starts
>at the bottom winds to the top, then I insulate it and wind back down to
>the bottom, insulate again and wind to the top and coat it in
>polyurethane. Does this sound right or should I wind one layer then the
>next layer and then the last layer, each not being connected to the
>others and then all three connected to ground and the three on top all
>connected the terminal. Which is right or will they both work??
>
>Chris
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