RE: Math help...

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi John,

I always get around 30% efficiency for conventional spark gap coils.  The
spark gap is the main "waster" of energy.  I use lots of measurements and
plug the numbers into MicroSim as in:

http://hot-streamer-dot-com/TeslaCoils/MyPapers/modact/modact.html

Also, Note the post at:

http://www.pupman-dot-com/listarchives/1999/June/msg00323.html

Cheers,

	Terry

At 10:32 AM 7/10/2001 -0700, you wrote:
>Bert -
>
>I agree with your excellent comments below, however, I believe it should be
>pointed out that the energy transfer in all magnetic circuits is 100%
>because there are no losses in magnetic circuits. Electric losses are only
>in electric circuits and the efficiency is the ratio of output/input. This
>means that when reffering to electrical efficiency the input and output
>calcs should be shown. This can be a difficult task when talking about Tesla
>coils.
>
>I understand the voltage can be used to find the joules (energy) in the
>primary capacitor but how do you determine the energy in the secondary
>circuit when the secondary voltage of an operating TC is an unknown? I
>avoided this problem by using a light bulb for the secondary load in my
>test.
>
>When we say the TC efficiency can be about 90/95% what are the input and
>output conditions? Coilers talk about TC efficiencies but I have never seen
>any published input/output calcs. In my TC Construction Guide page 14-4 I
>show a simple efficiency test I made with a small TC and the input/output
>calcs were shown. Have any other coilers made these tests? The test showed
>an overall efficiency of 56%. Larger coils have efficiencies much lower.
>What are the input and output calcs for the 90 to 95% efficiencies? How do
>they relate to the overall efficiency? How do these 90/95% efficiencies vary
>with TC size?
>
>John Couture
>
>----------------------------
>
>-----Original Message-----
>From: Tesla list [mailto:tesla-at-pupman-dot-com]
>Sent: Sunday, July 08, 2001 9:02 PM
>To: tesla-at-pupman-dot-com
>Subject: Re: Math help...
>
>Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><bert.hickman-at-aquila-dot-net>
>
>Josh and all,
>
>That's an excellent question, Josh - and it goes to show that very few
>things are truly simple in coiling... :^)
>
>Malcolm is correct. Previous experiments have measured primary tank
>capacitor voltage during a complete primary-secondary-primary energy
>transfer cycle. These have shown that the efficiency of the first
>primary-to-secondary transfer (from an initially charged tank capacitor to
>a fully resonating secondary) can indeed exceed 90%. However, this makes no
>statement regarding how efficiently we were able to charge the tank cap
>from the mains supply in the first place. For that, we need to talk a bit
>more about capacitor charging circuits...
>
>-------------------   snip
>