[Prev][Next][Index][Thread]

Re: 3 Pahse Rotary Gap

> Original Poster: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>

> Any TC system driven at the mains frequency and pushed to multiples of
> 120 BPS either due to adequately undersizing the tank capacitor for
> static gap systems, or forced by use of an asynchronous rotary (or
> multi-presentation synchronous) is going to operate in 'spike charged'
> mode as you put it.  This method is much more the norm than the
> exception and certainly works adequately. 90% of all practising coilers
> can't all be wrong.  At the same time I cannot dismiss the valid point
> you make about the more efficient charging gained from using more of the
> sine curve. Would it alone make enough of a difference however to
> overcome the smaller bang size where only one third of the system's tank
> capacitor bank, and hence total energy in Joules is available per pop? I
> think I'd need to see two coils side by side with the same 'toaster
> watts' input from the wall socket, one 3-banger and one standard model,
> to be convinced on the merits of the 3-banger scheme.

You're right that the capacitor bank would be underutilized
in this design, in order to use three-phase without diodes.
I should point out that this '3-PH rotary gap' approach is 
not one I would normally recommend, unless one was just short 
on diodes, and long on capacitors!  I like HV diodes very much, 
and they are the best way by far to combine the power of three 
phases onto a singular primary tank circuit.

> > > Do you know anyone with a large Tesla 'show only'
> > > (as opposed to reseach) coil that *ever* demonstrates it at 1/3rd 
> > > or 2/3rd's power of what it can achieve at full horsepressure?
> >
> > Yes!  I do all the time!  I will always start the coil at
> > the _lowest_ safe power setting, about 70BPS for my coil,
> > which is 1/5 full power.  Ramping the coil up to full power
> > from there thru the entire power range is far more dramatic
> > than just turning it on at a full, but monotonous, power level.
> 
> I guess I misworded my question. "Would you or anyone you know who
> operates a show coil be happy if full power operation were not 
> available to you/them?"

No, I would be sad in that case... However, my point by
mentioning the contactors was that the operator would
have a coarse degree of control over the power level,
simply by using three contactors.
-- 


-GL
www.lod-dot-org