variable speed rotary was DC powered Coil single phase 14.4KV 5KVA pig DCPTC ?-)

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Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>



-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Saturday, March 26, 2005 7:00 PM
To: tesla@xxxxxxxxxx
Subject: Re: DC powered Coil single phase 14.4KV 5KVA pig DCPTC ?-)

Original poster: tesla@xxxxxxxxxxxxxxxxxxx

 > Original poster: Finn Hammer <f-h@xxxx>
 >
 > Ken,
 >
 > You don`t really need a DC supply to do what you want.
 > You can get equal bangsize with a sync gap, provided you use unequal
 > spacing btwn the electrodes.
 > The incoming waveform of the AC supply is of litle relevance in an
 > inductor
 > limited supply, where energy is stored whenever current is flowing. You
 > can
 > have the high voltage at surprising points on the AC supply.

With a filtered DC power supply, you have have high voltage all the time
at any time. To be able to charge the tank cap whenver you want at any
rate you can supply power for you need a constant supply of electricity.
You cannot do this with AC.

<snipeze>

Thank you for all the suggestions and viewpoints thus far. One was quite
funny.

Actually I am seeing the possibility of reducing some expensive parts as I
may return my ballast back to a dedicated arc welder or sell it. After
reviewing the posts and revisiting Richie's site, it would seem I now have
the advantage to strap the neutral piggie lug to ground thus grounding the
otherwise floating transformer core (dual horn). I have selected for now a
4UF 15kv Maxwell filter cap that will be Slowly ramped up to a max primary
of `160-165 volts. As the voltage doubling circuit and "de-queuing" (lots of
cheap diodes) and charging inductor make sense to me for linear power verses
break rate.

Current is controlled by carefully starting the VSRG at a low break rate. An
offline response suggested a spdt rotary (one fixed electrode to charge the
tank one to ring the bell). (1) Any suggestions on how large the diameter of
the disk should be and the number/size of the electrodes for reasonable
scalability? I will select the DC motor based on this. I am starting with a
.02 uf tank MMC I'll add some caps to take >30KV. (2) I am open for
suggestions on construction of the charging inductor. Large ABC fire
extinguisher at hand.

The pig is concealed inside a well grounded Pool heater cabinet on a slab
with room to spare. The 240/60 comes from a dedicated 60 amp Motor safety
switch tied to a dedicated breaker box on my deck. The controller is being
constructed on a rolling 36" 19" rack mount with a gutted industrial PC
cabinet to house all the controls excepting the variac which barely fits in
the remaining rack space.

Thanks for all the fun,
Jim Mora