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Re: Sphere/Toroid Comparison Chart
Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
I think the difference in the voltage profiles is more due to how the
toroid messes with the fields around the top of the secondary instead of
the shorted turn effect. The top of secondaries seems to be very
insensitive to the shorted turn top terminal. If Paul is listening maybe
he can explain more and what the effects of a split top terminal may be.
At 06:40 PM 5/9/2001 +1200, you wrote:
>On 8 May 01, at 23:23, Tesla list wrote:
>> Original poster: "Terry Fritz" <twftesla-at-uswest-dot-net>
>> Hi Bart,
>> There is another fun twist to all this. When a top load is added to a
>> secondary coil, the voltage profile along the coil changes which
>> affects the coils effective inductance. The inductance can actually
>> drop as much as 20% do to this effect. See:
>> for my actual voltage profile measurements and:
>> for Paul's computer analysis of this.
>That is not at all unreasonable considering the coupling which must
>exist between what is essentially a bunch of parallel shorted turns
>and the top of the windings. I might suggest a further twist to be
>analysed in the tssp project: what effect does cutting a slit in the
>terminal have on the L/C distribution in the resonator? I've done
>this and the frequency changes very little despite the removal of the
>shorted turn (goes up a little from memory) so ???????????
>> BTW - Paul's computer analysis was generated long before the actual
>> measurements were taken which confirmed the models. Another triumph
>> of computer modeling :-)))
>> E-Tesla6 uses voltage profile curve fitting from Paul's TSSP data to
>> account for this effect. Those interested should check out the mass
>> of fascinating information at:
>> We will be studying the remarkable implications of this work for
>> decades to come!!