RE: [TCML] Ballasting my Homemade Transformer.

["Jim Mora" <wavetuner@xxxxxxxxx>]

Hi Bart,

Great shot! That almost says it all. Clearly, this opens the winding window
to get the copper in there! Stacking the E cores affects the current by a
mathematical function, yes? This discussion simplifies the math challenged
such as myself :-^)

It seems weird to me that the cross section area is mostly discussed in this
vein. If I knew the answer to this, the simplified, pseudo functions of core
geometry would be clear to me.

Thanks Much,
Jim Mora

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of bartb
Sent: Monday, May 04, 2009 6:40 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Ballasting my Homemade Transformer.

Hi Jim,

I should show an NST 12/60 broken down:
http://www.classictesla.com/photos/nstrepair/Image4.jpg

There you can see the two E cores.

Take care,
Bart


bartb wrote:
> Hi Jim,
>
> Sure. For example a Franceformer 12/60 NST uses 2 E-cores in just this 
> fashion. The primary is located in the center leg and center to the E 
> cores. There is a secondary on the same center leg to each side of the 
> primary (with of course shunts between the primary and secondaries top 
> and bottom of the center leg).
>
> As Phil mentioned, it may not make the most ideal transformer and some 
> slight leakage if the cores do not butt together nice and flat, but 
> that's not a big deal if you used the cores for a high voltage 
> transformer. If the ends are not flat, then you'll certainly want to 
> ensure it's potted to prevent buzzing. BTW, if you use a potting 
> compound like wax or other that gets relatively hard, when the potting 
> material is about half cured, energize the transformer (this will pull 
> the two cores together nice and tight and any potting material that 
> had seeped between the two cores is squeezed tight providing a nice 
> packed seal between the two cores). Makes for a silent running 
> transformer. I energize the tranny two or three times for about 5 
> seconds at different stages during the curing process (while the wax 
> or whatever is still very soft).
>
> Take care,
> Bart
>
> Jim Mora wrote:
>> Hello,
>>
>> Good reference material! Since we are on the topic, I was wondering 
>> if (2) E
>> cores could be used (opposing each other) without the I core. This would
>> double the winding window and still allow for some leakage spacing. (4)
>> would double the core size yet again (two deep). I have a number of 
>> beefy
>> transformers from an inverter cabinet.
>>
>> My goal is to make a seriously stiff filament transformer, So in 
>> review: 150
>> -200 turns for 240, wired sized for current in and out, 2.25-2.5 
>> inch^2 for
>> each kwatt. Good stuff!
>>
>> Jim Mora
>> Anyone see issues with using dual inverted stacked E cores?
>> -----Original Message-----
>> From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On 
>> Behalf
>> Of David Rieben
>> Sent: Sunday, May 03, 2009 6:37 AM
>> To: Tesla Coil Mailing List
>> Subject: Re: [TCML] Ballasting my Homemade Transformer.
>>
>> Hi all,
>>
>> I took the core of a gutted defunct x-ray transformer (I
>> seem to burn them out a lot ;^(), and rewound each
>> "leg" with 105 turns of #8 THNN building wire,>>>
>> <snip>
>>
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