Re: [TCML] Why air-core?

[Gary Lau <glau1024@xxxxxxxxx>]

Brian, All,

Thanks for the many responses.  Yes I overlooked the hysteresis loss issue.
One of my motivations for asking is the thought that having a ferrite core
would allow the same primary and  inductance to be achieved, with far less
wire.  And lower losses, due to using less copper?  No - while I can't
actually guess what the hysteresis losses might be compared to the reduced
resistive losses, odds are losses would be higher.

Regards, Gary Lau
MA, USA

On Mon, Oct 3, 2011 at 7:42 AM, Brian <brianv@xxxxxxxx> wrote:

> Gary,
>
> All of what you mentioned is true and I may add that Air cores are also
> used
> at high frequencies to eliminate the loss due to hysteresis that would be
> found in steel core material not just in tesla use.
>
> But yep everything you said is  true.
>
>
> --Brian
>
>
> -----Original Message-----
> From: Gary Lau [mailto:glau1024@xxxxxxxxx]
> Sent: Saturday, October 01, 2011 9:17 PM
> To: Tesla Coil Mailing List
> Subject: [TCML] Why air-core?
>
> 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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