Re: [TCML] Why air-core?

[bturner@xxxxxxxx]

Why not use this transformer to power a classical Tesla Coil??? At 20KHz,
even though it would take a very small primary cap, you'd have near-CW
operation!!! Sounds like you would need to make the 20KHz front-end driver
for the transformer though.

Would also make a killer Jacob's Ladder too!




> Isn't a Tesla Coil defined as an air core resonant rise transformer
> though?
> Kevin.
>
>
> Sent from my HTC Inspireâ?¢ 4G on AT&T
>
> ----- Reply message -----
> From: "mike hollingsworth" <megavolts_61@xxxxxxxxx>
> To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
> Subject: [TCML] Why air-core?
> Date: Sat, Oct 1, 2011 9:50 pm
>
>
> I have a x-ray transformer that puts out around 40kv at 20kHz and about
> 2.5kVA.  This little monster is about 4.5 inches in diameter by four
> inches tall, Â so it is conceivable that a TC could be made with a core of
> such material.  it would have to be a fairly long, skinny core and most
> likely immersed in oil to work, but if one designed a coil to operate at
> that low a frequency,  I don't see why it couldn't be done.
> Mike
> Â 
>
>
> ________________________________
> From: Eric Goodchild <ericgoodchild@xxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Saturday, October 1, 2011 8:22 PM
> Subject: Re: [TCML] Why air-core?
>
> On 10/1/2011 7:16 PM, Gary Lau wrote:
>> I was asked a fundamental question about Tesla coils recently.  I
>> _think_ I
>> knew the answer, but I'd like to check.
>>
>> A Tesla coils is strictly an air-core transformer.  I said that steel
>> or
>> ferrite cores are not used because:
>> 1) Core saturation would be likely
>> 2) The conductive core would degrade the high voltage standoff
>> capability
>> 3) The coupling with a cored design would be too high
>>
>> Did I get it right?
>>
>> Thanks, Gary Lau
>> MA, USA
>> _______________________________________________
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>> http://www.pupman.com/mailman/listinfo/tesla
> I strongly agree with 1, core saturation would defiantly be a problem,
> particularly with a DRSSTC. At hundreds of amps peak you would need an air
> gap so big you may as well call it air core... This is how I figure it.
>
> Another thing I may add to that list  is that the size of the core would
> likely be massive if you could manage to get it to not saturate. A core of
> this size would be very unwieldy and heavy.
>
> 2 and 3 almost make logical sense to me.
>
> Eric
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> _______________________________________________
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