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Re: Tesla Coil Power Factor
Terry, Malcolm, and all,
There's one more sweet spot at around k=0.22... :^)
This is probably the one to shoot for if you've got good gap quenching.
Sorry to hear about the voltage probe letting the smoke out, Terry! What
was the design flaw that caught up with it?
-- Bert --
Tesla List wrote:
>
> Original Poster: Terry Fritz <terryf-at-verinet-dot-com>
>
> Hi Malcolm,
>
> Thanks for the "sweet spots". I knew someone would have them. I
was
> trying different couplings this afternoon but it didn't make much
> difference in my case. There is still some considerable charge left on the
> primary after quench. I'll test this more.
>
> Unfortunately, during the last test, the voltage probe measuring
the cap
> voltages blew the resistor string to bits (there is a certain visceral
> thrill when one is turning up the old variac about to max and suddenly a
> loud and sickly, bang!...arc...fizz sound is heard :-)). An old design
> flaw in the thing finally caught up with me. Of course, the 30 feet of
> fiber-optic cable protected the scope and such but the $30 voltage probe is
> trashed. I won't be able to take direct voltage measurements for at least
> a week or so :-(. Perhaps I can continue with my other measuring
> instruments in the mean time. Some times the bleeding edge of technical
> research is painful.... But that what makes it so much fun :-))
>
> All the best,
>
> Terry
>
<SNIP>
> > The sweet spots in descending order are 0.6, 0.385, 0.28, 0.18,
> >0.15 0.12....... These are the math values for a lossless system.
> >As Bert pointed out once, the fact that the system is losing energy
> >while effecting transfer means that the practical values are somewhat
> >higher than these and exact values for a particular system are
> >dependent on losses for that system (e.g. a lower Q primary will
> >require higher k than one with a higher surge impedance to hit the
> >sweet spot).
> >
> >Malcolm
> >
> >