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

Re: ASRSG question

Original poster: "Mike" <mikev@xxxxxxxxxxxxxxxx>

Hi Ed,
             Writing from work here. We also use a large variac configured
as a variable inductor, 50 amp unit, sits in a plastic, cut down 55 gallon
drum, oil covered with extension shaft and steering wheel.  Works into a 20
KVA transformer, great control, nice and smooth, good current limiting.
Mike
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Friday, April 08, 2005 2:02 PM
Subject: Re: ASRSG question


> Original poster: Esondrmn@xxxxxxx
>
> David,
>
> Do you have a safety gap across the rotary gap?  If not, you should add
> one.  I had a 60 hz resonance problem with my 5 kva transformer and the
> welder being used for ballast at one time.  It blew one of my commercial
> caps.  The primary tank voltage was going to some extremely high level.  I
> added a safety gap directly across the cap just for a test and it fired
> like a rifle.  I then moved it to across the rotary gap and it was still
> firing.  I removed the welder and used a large variac core for ballast and
> now the safety gaps never fire.
>
> Ed Sonderman
>
>  >Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>
>
>  >I tried both .1 uFd and .2 uFd. .2 uFd is a pretty big capacitance,
>  >I know, but the 3500 rpm is the MAX rpm rating of the motor
>  >and I wasn't running it at its max rpm. The rsg motor is a DC
>  >with infinite speed control via a variac but I can't really tell ex-
>  >actly what rpm I'm running. I can only aproximate it by measuring
>  >the input voltage and multiplying the product of the input volt-
>  >age/130 since 130 VDC is the rated voltage of the motor. I
>  >figured the 15 kVA pig can charge even a pretty large primary
>  >cap pretty fast although I haven't done the exact math on this
>  >with JAVATC yet.
>  >
>  >The pig is ballasted with a the guts of a 225 Lincoln arc welder
>  >set at its maximum (225 amp) weldeing setting and I am using
>  >(2) .1 uFd, 50 kV Hipotronics pulse caps for either .1 uFd
>  >byt using just one, or .2 uFd buy paralleling them.
>  >
>  >David
>
>
>
>
>