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Re: Toroid Design Features
From: Chuck Curran [SMTP:ccurran-at-execpc-dot-com]
Sent: Wednesday, November 12, 1997 8:52 PM
To: Tesla List
Subject: Re: Toroid Design Features
Bert:
Thanks for the comments, I'm still working with one local supplier for the
toroid at the moment. Your comments along with several other people's will
provide for additional alternatives as I get this put together. Tomorrow a
different supplier will be dropping off a catalog on all types of PVC sewer
and water pipe. I'm looking for another large diameter form and it appears
there stuff will be worth looking at. I'll keep you posted as I absolutely
hand build everything I use!
Chuck
-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
Date: Sunday, November 09, 1997 11:50 PM
Subject: Re: Toroid Design Features
>
>From: Bert Hickman[SMTP:bert.hickman-at-aquila-dot-com]
>Reply To: bert.hickman-at-aquila-dot-com
>Sent: Sunday, November 09, 1997 5:31 PM
>To: Tesla List
>Subject: Re: Toroid Design Features
>
>Tesla List wrote:
>>
>> From: Chuck Curran[SMTP:ccurran-at-execpc-dot-com]
>> Sent: Saturday, November 08, 1997 12:09 PM
>> To: tesla-at-pupman-dot-com
>> Subject: Toroid Design Features
>>
>> Hello All:
>>
>> I'm in the process of deciding on how to prioritize coil improvements for
>> the next few winter months. Near the top of the list is the toroid. I
am
>> going to get pricing for a spun aluminum toroid and that is where a
question
>> pop's up right away.
>>
>> Many of us have made a toroid using a similar set of design features.
>> Specifically, a flat center disk surrounded by the "Donut". The large
>> radius Donut clearly prevents the premature spark breakout, but results
in a
>> shape that may increase the cost of a spun aluminum item. Here's the
real
>> question. When I draw up a design to take to a local spinning supplier,
I
>> would like to have as much flexibility as possible to control the cost.
I
>> see a toroid that would be, let's say 10" thick with a 5" edge radius as
>> being just as effective as one with the 10" diameter outer donut coupled
to
>> a thin center disk. I hope the cost would also be lower. The
capacitance
>> should be almost identical too. Have I missed something here, or would
the
>> thick top hat be just as effective? We have many local metal spinning
job
>> shops and any flexibility in the design would sure be a benefit. Thanks
in
>> advance for any comments.
>>
>> Chuck Curran
>
>Chuck,
>
>The outer surface doesn't need to even be a complete circular
>cross-section. As long as the SMALLEST radius of curvature is say 5" or
>greater, it will work properly with the same breakout voltage
>characteristics and the self-C will be about the same. Since the top of
>the secondary winding itself creates a significant degree of e-field
>"shading", the following cross-sectional shapes will all be roughly as
>effective as long as you don't elevate the toroid very much above the
>top of the winding.
>
> ..............................
> . .
> . .
> . . (A)
> . .
> ..............................
>
>
> . . . .
> . . . .
> . . . .
> . .--------------. . (B)
> . . . .
> . . . .
>
>
> . ...................... .
> . .
> . .
> . {open area) . (C)
> . .
> . . . .
>
>
>Safe coilin' to you!
>
>-- Bert --
>
>
>