Re: triggered gaps in Re: Three phase TC

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

HI,

I have not been following this three phase coil thread well but...

If one needs a standard rotary gap to do three phases, having three
rotor/electrode sets 120 degress out of phase but all on the same motor
shaft may be an option.  It would be a bit hard to get the right phase
matched to the right rotor.  Maybe trial and error with a strobe light...

It sounds a bit like you are thinking of geting 120 degrees out of the
three top streamer waveforms.  That will be "tough" :-))  You may be able
to use a Marx generator type circuit or something like Marc's triggered gap
to at least fire them at the right timing...  But once they fire, the
waveform timing will jitter all over the place depending on many things
like streamer length...  However, I am not sure anyone would ever notice
any difference regardless...

Cheers,

	Terry


At 07:54 AM 7/15/2001 -0700, you wrote:
>One of the trickier things will be that I suspect that it might be tricky
>maintaining the 120 degree timing once the streamers start to form and the
>coil's resonant frequency drops.  If you use a constant time delay, this
>will have the effect of decreasing the number of degrees (a 10% drop in
>frequency would mean you've just gone to 108 degree shift).
>
>On the other hand, I don't think it will make any difference... a few
>degrees one way or another isn't going to change the delta V between the top
>loads all that much.
>
>
>As to delta vs Wye discharges (the photos are way cool by the way), it is
>probably more determined by the electric field, which in turn will be
>determined by the ratio between topload diameter and spacing between coils.
>If you want small toploads far apart, you might need to go to multiple
>stacked toroids to get enough Ctop.
>
>Also consider that the sparks grow over many cycles, and that as the sparks
>grow, the efield among the toploads will change dramatically...
>
>If you want the "appearance" of delta discharges, you can get that by
>running a DC power supply, and just firing the coils in pairs at a suitable
>rate.  First you fire 1&2 simultaneously, then 2&3, then 3&1.
>
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Saturday, July 14, 2001 9:27 PM
>Subject: Re: Three phase TC
>
>
>> Original poster: "Bert Hickman by way of Terry Fritz <twftesla-at-qwest-dot-net>"
><bert.hickman-at-aquila-dot-net>
>>
>> Chris,
>>
>> The sequence of three trigger pulses, separated by 120 RF degrees at Fo,
>> can be generated at whatever break rate is desired, and you could "fire"
>> the gaps at this rate for however long you desired. Triggering could be
>> done synchronously with the incoming single phase mains, or by using a
>> variable rate pulse generator to drive a variable break rate if using a
>> DC resonant charging system.
>>
>