Re: Suggestion on Power Supply?

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

Original poster: "Christoph Bohr by way of Terry Fritz <teslalist-at-qwest-dot-net>" <cb-at-luebke-lands.de>

Hi Terry


Thanks for your advice.
I feared it might be that way. I will try to get more capacitance ( quite
hard to get good pulse caps to germany  they are allways on ebay-dot-com but
hardly ever on ebay.de, I'll have a buddy pic up some when he is on vacation
in the US )
The async gap is something I really didn't want to have, but as my motor
won't sync its the only gap I have at the time.
I have to use the RGS as I'm running a magnifier that almost doesn't run
with my sucker-gap.
In normal 2coil mode the suckergap works fine up to 5KVA troughput but thats
really way to hard for the single 30nFcap.
I was looking forward to upgrading my cap to 90nF and the BPS maybe to
around 400BPS but I guess I should really try to get another motor to build
a sync gap.

The other thing is if I really only get 150 Watts troughput the 3 feet
streamers I'm getting continously would be really too big. I don't think the
efficiency of my setup can be that good as it's only a bunch of parts I had
at hand trown together....

Nevertheless I will follow your advice and work on the problems you pointed
out. I know sometimes I come up with really strange quentions but I'm still
a beginner and think it's better to ask than to blow the whole thing up ;-)

sofar, thank you very much

sincerely


Christoph

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, May 06, 2003 9:04 PM
Subject: Re: Suggestion on Power Supply?


 > Original poster: "Terry Fritz" <teslalist-at-qwest-dot-net>
 >
 > Hi Christoph,
 >
 > At 07:45 PM 5/6/2003 +0200, you wrote:
 > >Hi!
 > >
 > >this thread really brought up new insight into the topic to me, but
araised
 > >one further question.
 >
 > It's sort of messy stuff.  But it is real important so it is worth
figuring
 > out.
 >
 >
 > >I'm using a 30nF tank cap with a 200BPS async rotary ( BTW for those who
 > >remember, I just cant get that damn thing to sync....probably I removed
too
 > >much material from the rotor but works not too bad this way )
 > >
 > >referring to that formula from richie burnetts homepage:
 > >http://www.richieburnett.co.uk/rotary.html
 > >
 > >P = 0.5 x BPS x C x Vē
 >
 > 0.5 x 200 x 30e-9 x 10000^2 = 300 Watts
 >
 > Not that a sync gap can always fire at a say a 10000 volt peak every
 > time.  Where an async gap may fire at any voltage.  This reduces the power
 > by 1/2 on average with an async gap.  So in the above equation if the peak
 > voltage of the transformer where 10000 volts,  you would only get 150
watts
 > on average out of the coil with an async gap.  You might be far better off
 > with a static gap firing like crazy.  But the RMS currents will be pretty
 > high and much harder on the cap.
 >
 > Note that a say 15000Vrms transformer has a peak output voltage of 15000 x
 > SQRT(2) = 21213.2 volts.  You multiply the RMS voltage by 1.4142... to get
 > peak volts.
 >
 >
 > >Is it right that I can only get a power throughput of ca 450 Watt at 10KV
 > >that way? Or am I messing up the units and it should be 4500Watt?
 > >
 > >from the reading of my amp-meter it should be something like 450Watt.
 > >My power supply should be able to deliver around 10 to 20 times more, but
I
 > >think with that cap and 200 BPS I can't put more power through the
system.
 > >Just wanted to be sure before messing around with my rotary......
 >
 > You have a pretty big system to be running less than power than a little
 > 6/30 NST :-p  You need a higher BPS and more caps.  A quick fix is to go
to
 > a static gap, but watch the cap heating.
 >
 > Cheers,
 >
 >          Terry
 >
 >
 >
 > >I know my lack of math knowledge must really hurt, but please help me
anyway
 > >;-)
 > >
 > >Thanks in advance.
 > >
 > >Christoph
 >
 >
 >
 >