Re: [TCML] Why air-core?

[Carl Noggle <cn@xxxxx>]

Also, the rate of change of the current is high enough to create a 
strong enough magnetic field without a core.  It's cheaper that way, if 
nothing else.



> 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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> > Tesla@xxxxxxxxxx
> > 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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