RE: TC Optimum Coupling (was RE: Auto Quenching - OOPs!! forget that one ;-)

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

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>


Marco -

Because raising the secondary (K reduced) is such a common practice it
should be possible to estimate the loss in secondary voltage when this is
done. When the K is reduced the voltage loss is not evident in the equation
t = 1/(2Kf)   This equation indicates that when K is reduced only the t is
changed. Are there other equations involved that would show the voltage and
losses?

It is interesting that the opposite occurs when the K is reduced and the
voltage increases when the secondary turns are increased. The JHCTES program
points this out. Proper design would dictate the turns should be increased
instead of raising the secondary.

John Couture

------------------------------



-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Monday, September 02, 2002 7:08 AM
To: tesla-at-pupman-dot-com
Subject: RE: TC Optimum Coupling (was RE: Auto Quenching - OOPs!! forget
that one ;-)


Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Marco.Denicolai-at-tellabs-dot-com>

Hi John,

> Original poster: "John H. Couture by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <couturejh-at-mgte-dot-com>
>
>
> Terry, Antonio, Marco, all -
>
> Tesla coil theory and simulations must be used with caution.
> Increasing the
> K factor of Tesla coils can increase the secondary volts
> output? Reducing
> the number of secondary turns can increase the K Factor. If
> you continue
> with this reasoning you might believe that you could use only a few
> secondary turns for big sparks or secondary voltages. See below.

You are supposed to act on the coupling factor k without changing L1,
L2, C1 or C2. Otherwise your tuning (and voltage gain) will change too,
mixing to the effect of the changed k. It is almost always about rising
or lowering the secondary.

> Marco Denicolai says to "increase K as much as possible"
> (theory). But how
> do you determine this parameter for a real world Tesla Coil?
> Real world
> Tesla coils generally mean compromises have to be made.

Correct, that's why I don't believe many will strive to reach that k=0.6
to win 18% in secondary voltage. I wouldn't...

Best Regards