How would one make themselves the slug tuned core inductor that you are
talking about to completely control a 15kva pig? I am looking for form size,
number of turns, AWG, and core details.
Thanks
Victor
-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Saturday, November 12, 2005 8:04 PM
To: tesla@xxxxxxxxxx
Subject: Re: PFC Question
Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
They will saturate. That's why when we used to use old variac cores
we always gapped then at .080 inch. A fabricated steel clamp held
the variac from spring apart and a bandsaw did the work. An 80 mil
piece of plastic was epoxied in place to form the gap. They didn't
saturate.
Now we use our own slug tuned cores with a small DC gearmotor to
accomplish the same control and makes it a completely variable
process. Current is adjusted completely independent of voltage.
Dr. Resonance
> > Original poster: Ed Phillips <evp@xxxxxxxxxxx>
>
> > I have never understood why saturation isn't a factor in using an
> > ungapped variac in series with a load.
>
>Ed, i think we speak about the case of using the variac as an
>autotransformer, not as variable inductor.
>
> > An easy check on the leakage impedance would
> > be to short the two ends of the winding and run say about 1 amp (100
> > watt bulb in series across 120V line) and measure the voltage drop
> > between the brush and the shorted ends for different brush
> > positions. Why don't you do that and publish the results here? Only
> > a few minutes work.
>
>imo it will be difficult to get an acceptable accuracy of the
>measurements, as the resistance of the winding can be compared
>with the leakage inductance impedance, and it`s worse - both these
>values are very small. for example, i have only usual dmm - i haven`t
>got a measuring bridge.
>we have to make the measurement by comparing the voltages (as i
>suggested before in the thread about my psu), but i need one more
>variac for this.
>
>-----
>The solution to no primary hits lay in getting rid of the primary!
>This is no joke either.
>20-06-96 (c) Richard Hull, TCBOR
>
>