Re: Induction heating in toroid / short circuit of secondary

To: tesla-at-pupman-dot-com
Subject: Re: Induction heating in toroid / short circuit of secondary
From: David Trimmell <davidt-at-pond-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Sun, 26 Dec 1999 11:13:48 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

I am curious, perhaps I am on a different plane of thought, but...

Every *Toroid* I have ever used is not a "true" donut shape. I have always
used *conductive* Al tape or some other metal material in the **center** of
the Toroid, as it assisted with support, etc. Now IF I am using a Toroid as
a wheal type shape, then how does the *circuit* SEE it as a "shorted" turn?
It should "see" it as a lumped capacitance, no? I think I am missing
something here...

Regards And Happy Holidays!

David Trimmell

At 07:55 AM 12/25/99 , you wrote:
>Original Poster: "Steve Young" <youngs-at-konnections-dot-com> 
>
>Dale, Kennan et al,
>
>I'll intersperse a comment under your interspersed comment below:
>
>Subject: Re: Induction heating in toroid / short circuit of secondary
>
>
>> Original Poster: Kennan C Herrick <kcha1-at-juno-dot-com>
>>
>> Dale-
>>
>> I'll intersperse a few comments.
>
><SNIP, SNIPPITY, SNIP> (Terry, take note!)
>
>> >    That's why I checked for arc production between the open ends,
>> >    to check for significant induction.
>> >    Ends arced, so it appears there is !
>> >         or can you present another mechanism responsible ?
>> >
>> That might offer a handy way to check for t.c. power output:  Just insert
>> a meter there!  Or better still--try connecting a meter across the
>> diameter of the toroid, measuring the voltage there.  Or maybe a few LEDs
>> or even a little battery-operated LCD panel meter suitably rectified.
>> Endless possibilities!
>
>The idea is to see what power gets wasted heating the toroid.  Consider
>this:  If you hook a small flashlight bulb across a toroid gap, and you get
>no or little glow from the filament, then very little power is being wasted
>in the torroid.  On the other hand, if a 100 watt light bulb burns out, then
>we have a torrid torid, and we should all think about using gapped toroids.
>One could use various sized bulbs, starting with higher wattage and working
>down, to roughly determine what power is coupled into the toroid.  You might
>have to tuck the bulb inside the torroid, so it can be seen through the gap,
>to avoid arcs from the bulb which will destroy it.  (In the world of RF
>oscillators, which our TCs are, the light bulbs are called dummy loads.  I
>think this refers to the load itself, not the person using it!)
>
>If some of you try this experiment, please share the results.
>
>Happy Y2K,
>Steve Young
>
>
>