Re: [TCML] Re: Spark gap Resistance

["Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>]

When k=0, there is no energy transfer (so efficiency is sort of 
senseless to state).

However, those values (well, 0.6 and 0.385) are well known values of 
coupling which will result in the voltage and currents arriving at zero 
at the same time leaving no residual charge (and that indicates 100% 
transfer). Great for a lossless system, but these systems have losses 
and as a result the effects of losses alter those values differently for 
each system, and because coupling is low, the benefit is null.

For high values of coupling, I can see benefit with energy transfer 
efficiency, but for low coupling values of which ALL Tesla Coils use 
which are not saturated under a high dielectric, the magic k values have 
no value. They could certainly be put to use for higher coupled systems, 
but higher coupled systems require a dielectric and design to prevent 
the voltage stresses from breaking down, and that is something best done 
in high voltage lab at a university or business site, not in a garage, 
basement, or spare bedroom. Well, I guess someone could build a little 
coil under these conditions at home, but not so easy for a moderate to 
large coil.

Take care,
Bart


nnanred1@xxxxxxxxxxx wrote:
> hi,
> the greatest efficiency occurs when the primary and secondary circuits resonate at the same frequency when they are decoupled.  k=0.  then you couple the circuits so that k= 0.6, 0.54, 0.385, 0.125.  when you do this the 2 coexisting waves in the coupled system have a frequency ratio of 2.  this causes an alignment of the 2 voltage waves and obtains a maximum in voltage or pulse power.
> get the paper by j. r. reed, "Greater voltage gain for Tesla transformer accelerators" in october 1988 issue of Review of Scientific Instruments and there is a test procedure to set the coef. of coupling so simple a child can do it.
> The paper is written to disclose the grand max in performance for the transformer with a coupling of about 0.54.  The national labs use a coupling of 0.6;  but dont let any of that worry you. the k setting procedure is good for any coupling; like k=0.12.
> people read this paper and think it is for the higher couplings.  it can install any coupling if u have an o-scope or electron voltmeter and a signal generator to tickle the coupled circuit with. 
> it really is simple.  and these operating points will produce the best transformers.  what holds it back is reading comprehension.
> by now,
>
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