Re: Control transformer

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

Original poster: "GEORGE STEIN" <afa2fg-at-msn-dot-com> 

Thanx Steve,
   I have several three phase filament transformers whose cores could be 
used for one of these devices. I am looking to the future for controlling a 
pig.

George


>From: "Tesla list" <tesla-at-pupman-dot-com>
>FILETIME=[4771F440:01C40713]
>
>Original poster: "Steve Zeitler" <zeitler-at-verizon-dot-net>
>
>
>----- Original Message -----
>From: "Tesla list" <tesla-at-pupman-dot-com>
>To: <tesla-at-pupman-dot-com>
>Sent: Wednesday, March 10, 2004 7:08 PM
>Subject: Control transformer
>
>
> > Original poster: "GEORGE STEIN" <afa2fg-at-msn-dot-com>
> >
> > Good evening folks,
> >    I am looking for a schematic, wiring diagram or specs. on the control
> > transformer that is used by the noen folks to control the current in their
> > bombarders/pigs. It is, I think, a DC control voltage applied to windings
> > on a transformer that controls the amount of current allowed to be drawn
> > through it. ie ballasting...
> >
> > Thanx
> > George Stein
> >
> > _
> >
> >This sounds like a thing I saw once called a magnetic amplifier. Consider a
>typical transformer core with 3 "legs".
>The windings are wound on the center leg. The 2 outer legs complete the
>magnetic path. In the magnetic amp, a "primary" winding was wound on each
>outer leg. Another winding of many fine windings was put on the center leg.
>AC was put on 1 of the primaries. The magnetic field ran thru the center leg
>and little of it reached the other primary on the other outer leg so...
>little output..
>When a DC current was run thru the winding on the center leg, a common
>magnetic field was created thru all 3 legs. The 1st primary driven by AC
>input modulated the common field and the modulated field was picked up by
>the other primary resulting in some output. The output AC could then be
>controlled by a much smaller DC current on the center leg. I saw one of
>these things once, it worked fine, with 0-100% output control.
>
>Steve Z
>