RE: [TCML] HV Transformer Winding

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hi Bart,
Maybe I missing something, but consider a long wound coil of say two layers.
The solenoid wound coil verses an Archimedes spiral must have effect on the
magnetics? I'm curious as I need to rewind a mongo primary. This hugh core
has a low amount of primary turns and a high turns ratio. I just picked this
gem up from Jack Henderson in San Diego. It will make an extremely stiff
plate transformer.
Jim


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Friday, April 24, 2009 9:01 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] HV Transformer Winding

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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