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

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul Benham" <paulb@xxxxxxxxxxxxxxxxxxxx>

Hi Jim,

I rely on the value of my charging choke to charge the primary capacitor at
a sensible rate from the DC power supply and have not needed to use a SPDT
rotary, it is around 10H at the moment and seems to isolate the power supply
and de-queuing diodes well from the RF present on the primary.  The amount
of current that builds up during the time the spark gap is conducting is
negligible, and the charging inductor has an air gap too.

Cheers,

Paul.

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, March 28, 2005 5:20 AM
Subject: variable speed rotary was DC powered Coil single phase 14.4KV 5KVA
pig DCPTC ?-)


> 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
>
>
>
>
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