Re: [TCML] Current control

["DC Cox" <resonance@xxxxxxxxxxxx>]

This does work but puts extra stress on the wiper brushes as the current
does not exactly divide in a linear fashion.  The auto-transformer effect
could put a high current across a small section of the winding and damage
it.

Better idea is to use a variable core reactor like I do.  Never have to use
any variacs at all.  Just pull the core out until the current hits the value
you require.  On the variable reactor and pole xmfr are necessary.  I've
used this setup up to 30 kVA with excellent performance.

Variacs for pole xmfr systems are rapidly becoming a thing of the past.

Dr. Resonance




On Wed, Jun 25, 2008 at 7:25 AM, Paul McGlen <fusion2xxx@xxxxxxxxxxx> wrote:

> Hi ,
>
> Another question for the knowledgeable out there.
>
> I am building a 10-inch coil driven with a distribution transformer. I plan
> to use two 45 Amp variacs, one to control the voltage and the other to
> control the current. Am I correct in thinking that to control the current I
> take a feed in from the output of the variac controlling the voltage and
> feef it into one end of the winding of the current variac and the wiper woul
> still be my output?
> If not can anyone give me a schematic showing the correct way. Also is
> there any benifit in putting a large inductor in line withe the variac that
> controls the current ( I do realise that this would be two inductors in
> series), but could I use the fixed one as a limiter?
>
> Paul M.
>
>
>
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