Re: toroid size

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "tesla by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla-at-paradise-dot-net.nz>

Hi Greg

Your toroid is very similar to mine (12"x43")
I have no troubles with breakout at around 6kVA input using either 8"(
53kHZ)  or 12"(90kHz) Sec (both have 54" of windings
6MOT's, 88nF, SRSG 300bps

Clearance at bottom pri to sec is >2" for either secondary.
Coupling measured (operating beat envelope) around 0.11 with the 12"sec
Best
Ted L in NZ
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, September 30, 2002 6:37 AM
Subject: toroid size


> Original poster: "Gregory Peters by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <s371034-at-student.uq.edu.au>
>
> Hello all,
>
> Does a 12"x46" Al duct toroid seem too large for a 8-10kW 12"
> diameter coil running at 200BPS? That is what I am currently using,
> and the coil will not break out without a sharp point. If I remove
> the sharp point, the secondary gets severe racing arcs, so hot that
> the coil immediately is ruined and needs repairing (no sparks break
> out of the toroid). The coil makes over 10 foot sparks with the
> breakout point, and I would have thought it would have no trouble
> with a toroid this big, even without the breakout point. Ideas,
> suggestions? I'm thinking of switching to 100BPS operation, but I'm
> scared I'll fry another coil.
>
> Cheers,
>
> Greg.
>
>
>
>