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Multi-layered Secondary HELP!!


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From:  Bert Pool [SMTP:bertpool-at-ticnet-dot-com]
Sent:  Sunday, February 15, 1998 10:55 PM
To:  Tesla List
Subject:  Re: Multi-layered Secondary HELP!!


> 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,

Wild Bill Emery and I have successfully used multi-layered resonator 
coils on a Tesla magnifier.  They will also work on a conventional 
two layer coil.  The advantage is high inductance with lower 
effective resistance of the windings.  We had *no* difficulty with 
additional capacitive effects, and the multilayer configuration did 
not cause us any other problems.  We have used a four layer coil in 
the secondary driver of the magnifier and a two layer resonator coil. 
 I have not attempted a three layer resonator like the one you plan, 
but I see no reason why it should not work.  You will not need any 
additional insulation between layers.  Wind one layer on the coil 
form and lightly coat it with polyurethane and let dry.  Wind your 
second layer and coat, then the third.  Make sure all layers are 
wound in the same direction.  I'd suggest making each layer about 1/4 
to 1/2 inch shorter than the one underneath, so as to make the 
lengths of the wire in each layer about the same (each layer is 
slightly larger in diameter, so you need to reduce the length of the 
winding slightly to compensate).  Because the three windings are in 
parallel, and because of the very tight coupling between the layers, 
any two adjacent turns will have approximately the same voltage on 
them, so there is little voltage difference between the turns of the 
three windings - no special insulation between layers is required.

Bert Pool
bertpool-at-ticnet-dot-com
TCBFW
> Chris
> 
> 
> 
> 
Bert Pool
TCBFW
bertpool-at-flash-dot-net