Re: Slide-choke construction

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

Original poster: "Hydrogen18" <hydrogen18-at-hydrogen18-dot-com> 

Heres a common problem, whats a easy way to move the core in and out?

---Eric
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Wednesday, May 12, 2004 9:55 PM
Subject: Re: Slide-choke construction


 > Original poster: "Dr. Resonance" <resonance-at-jvlnet-dot-com>
 >
 >
 >
 >
 > Another interesting advantage using a large sliding choke offers is that
it
 > can eliminate the costly variac altogether!
 >
 > With the core in full, only a few Amps (magnetizing currents) are drawn by
 > the HV xmfr so while it remains at the full 240 VAC it doesn't get any
 > appreciable current so nothing happens.  The xmfr can't supply enough
 > current to charge the caps.
 >
 > As the core is slowly withdrawn the current begins climbing.  You can set
 > the current point at any current level you desire and do not need a variac
 > at all.
 >
 > It's an interesting concept and works very well.  We use this idea to
 > eliminate variacs in all of our larger systems.
 >
 > Dr. Resonance
 >
 >
 >
 >  >
 >  > this has nothing to do with the steel rod idea but it may help by
giving
 > you
 >  > a ballpark figure to work with. My current limiter was made by winding
 > about
 >  > 50-60 turns of 2.5 square millimeter house wire (rated at 25amps
 > continous)
 >  > onto an old MOT core this limits to current in my MOT bank to about
 > 35amps.
 >  > In terms of linkage http://tesla.reidconsulting-dot-com.au/tesla.html
details
 >  > exactly what you're building
 >  > and http://www.richieburnett.co.uk/ballast.html has a lot of info on
 >  > ballasting.
 >  > Hope this is of some help
 >  > Pat
 >  > ----- Original Message -----
 >  > From: "Tesla list" <tesla-at-pupman-dot-com>
 >  > To: <tesla-at-pupman-dot-com>
 >  > Sent: Thursday, May 13, 2004 2:10 AM
 >  > Subject: Slide-choke construction
 >  >
 >  >
 >  >  > Original poster: "Erik Byng" <ebyng-at-knox.edu>
 >  >  >
 >  >  > Hey list:
 >  >  > A while back, in a post titled "the amazing variable choke," someone
 >  >  > mentioned that they'd build themselves a slide choke, running a
bundle
 > of
 >  >  > epoxied steel rods through a pvc form with the coil wound on it.
I'm
 > now
 >  >  > thinking of building one myself, but the dimensions I'm a little
shakey
 >  > on.
 >  >  > I have a +/-300ft roll of 10ga thhn which seems up to the challange,
 > but
 >  >  > should it be wound with very few layers on a long form, or many
layers
 > on
 >  > a
 >  >  > short form?  I would think that to get the most out of the rod's
 > travel,
 >  > it
 >  >  > would have to be wound long..  5 or so coil layers over ten inches
of
 >  > travel
 >  >  > sound decent?
 >  >  >
 >  >  > Erik
 >  >  >
 >  >  >
 >  >  > --
 >  >  >
 >  >  >
 >  >  >
 >  >
 >  >
 >  >
 >
 >
 >


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft-dot-com).
Version: 6.0.665 / Virus Database: 428 - Release Date: 4/21/2004