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Re: Pseudo Toroid Design
From: BertPool [SMTP:Bert.Pool-at-flash-dot-net]
Sent: Monday, November 10, 1997 11:52 PM
To: Tesla List
Subject: Re: Pseudo Toroid Design
>
> From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
> Sent: Monday, November 10, 1997 2:22 PM
> To: Tesla List
> Subject: Re: Pseudo Toroid Design
>
> Hi Bert, all,
>
> > From: BertPool[SMTP:Bert.Pool-at-flash-dot-net]
> > Reply To: bertpool-at-flash-dot-net
> > Sent: Sunday, November 09, 1997 4:04 PM
> > To: Tesla List
> > Subject: Re: Pseudo Toroid Design
> >
> > [additional large snip]
> >
> > I have to take issue with the good Friar's comment that the inner
> > part of the top load not being important or "useful". Without an
> > inner disk, the toroid forms a perfect single turn short, which can
> > absorb a huge amount of your coil's energy. The disk "shorts" out
> > this single turn and prevents the toroid from acting as a short as
> > seen by the coil. We found this out on the extra coil on our large
> > magnifier. The resonator coil was driven with a transmission line, so
> > we didn't think a solid metal disk was important. We were wrong.
> > The toroid at the bottom of the coil (for field shaping) got so hot
> > it melted hot glue! Richard Hull had about the same thing happen
> > (Richard, correct me if my memory is wrong on this.) I always make
> > sure that I have a solid metal disk in the center of all toroids now,
> > regardless of size. Especially on magnifiers. The disk contributes
> > little or nothing to field shaping, but it *does* play an important
> > part of the toroid assembly.
> >
> > Smokin' them toroids in Ft. Worth,
> >
> > Bert Pool
> > TCBFW
> > bertpool-at-flash-dot-net
>
> I think it makes a difference where it is located on the coil. I've
> seen no difference between centre disk or no if the toroid is the
> last one in the chain (top of the resonator). I would imagine that
> anything approaching a short circuit would have a most detrimental
> effect if positioned at the base because that is where the current
> peaks.
> What are your observations regarding the two types when
> positioned at the business end of the resonator?
>
> Regards,
> Malcolm
>
Hello Malcom!
My top toroids have always had a shorting disk in the center. The
only time I attempted to use a toroid without a disk was at the
bottom of the resonator. The bottom toroid only had a cross section
of 3 inches and had an inside diameter of 8 inches - rather small.
My top toroids are 36 inches across with an 8 inch cross section, so
even if that one didn't have a shorting disk, the difference in mass
alone could mask any heating effects. More careful work needs to be
done in this area.
Bert Pool
TCBFW
bertpool-at-flash-dot-net