Re: [TCML] HV Transformer Winding

[Chip Atkinson <chip@xxxxxxxxxx>]

I think the deal with flipping coils on the NST coil hinges on where the
inputs and outputs are connected after the flip.

If you have a flat coil and flip it, you implicitly leave the input end at
the center and the output at the outside.  When you flip a solenoid, you
don't implicitly flip the contacts, they stay at the right or left end.  

With a NST coil, the input (or output) is at the center of the coil and
the thus the input is *not* flipped as is done with a solenoid an the
polarity will be reversed.

Chip

On Fri, 24 Apr 2009, bartb wrote:

> Hi Jim,
> 
> Flipping one of the hv coils in an NST will certainly change it's 
> direction (multilayer coil). I would expect the same with the 
> transformer Phil is building. This is why when re-assembly of an NST is 
> performed, getting the hv windings oriented correctly is a must. 
> Consider a flat primary coil and flip it (winding direction 
> perpendicular to the center changes).
> 
> Bart
> 
> Jim Mora wrote:
> > Hi Bart,
> > Flipping a coil bobbin does not change its winding direction (counter
> > intuitive). Test it with a spring of scrap piece of wire. Aren't neon
> > transformers wound in opposite directions (similar core scenario)?
> > Jim Mora
> >
> > -----Original Message-----
> > From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
> > Of bartb
> > Sent: Thursday, April 23, 2009 5:38 PM
> > To: Tesla Coil Mailing List
> > Subject: Re: [TCML] HV Transformer Winding
> >
> > Phil,
> >
> > I'm in the same boat as Finn here. I'm thinking the windings are wound 
> > in opposite directions myself, but I'm not certain. I expected that you 
> > would be winding the secondary coils on individual bobbins at first and 
> > simply sliding them onto the core (in which case you could just test it 
> > flipping one of the bobbins). But are you winding the secondary coils on 
> > the core itself? If so, then Finn's suggestion is certainly the test to 
> > perform.
> >
> > Take care,
> > Bart
> >
> > Finn Hammer wrote:
> >   
> >> Phil Tuck skrev:
> >>     
> >>> I have posted this on the 4hv.org forum, but as I started the project on
> >>> here I will include it on here as well.
> >>>
> >>>  
> >>>
> >>>   
> >>>       
> >> Phil,
> >>
> >> I have been thinking long and hard, but everytime I am close to a 
> >> conclusion, my head starts to explode, and I have to start over.
> >> So I will advice you to do what I would do myself:
> >>
> >> Energize the primary, and make a couple of nice test windings with 
> >> some of the scrap insulated wire you have stashed away for this purpose.
> >> You only need some 5-10 turns to settle the matter, really.
> >>
> >> Hope this helps,
> >> Cheers, Finn Hammer
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> >>
> >>     
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