ballast Inductor Choke coil (fwd)

To: "'Tesla List'" <tesla-at-pupman-dot-com>
Subject: ballast Inductor Choke coil (fwd)
From: Tesla List <tesla-at-stic-dot-net>
Date: Tue, 21 Apr 1998 00:25:09 -0500
Approved: tesla-at-stic-dot-net

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From:  Alfred A. Skrocki [SMTP:alfred.skrocki-at-cybernetworking-dot-com]
Sent:  Sunday, April 19, 1998 4:49 PM
To:  Tesla List
Subject:  Re: ballast Inductor Choke coil (fwd)

On Wednesday, April 15, 1998 12:42 AM Barton B. Anderson
[SMTP:mopar-at-mn.uswest-dot-net] wrote;

> Alfred,
> 
> I have a couple comments below from following this post.
> 
> Tesla List wrote:
> 
> > ----------
> > From:  Alfred A. Skrocki [SMTP:alfred.skrocki-at-cybernetworking-dot-com]
> > Sent:  Friday, April 10, 1998 3:50 AM
> > To:  Tesla List
> > Subject:  Re: ballast Inductor Choke coil (fwd)
> >
> > On Friday, April 03, 1998 5:39 PM Erik
> > [SMTP:ESchulz531-at-aol-dot-com] wrote;
> 
> snip>
> 
> > I stand corrected! Apparently I mis-entered the values in the last equation
> > on the original post. I apologize to all who were inconvienced. I do
> > however still stand firm on my conclusion that an inductance of this size
> > is impractical as a single layer aircore inductor, since it's D.C
> > resistance is still about 5 times greater than it's reactance and since;
> >
> >   Z = SQRT (( R * R ) + ( XL * XL ))
> >
> > The inductor would never allow more than about 200 watts to pass at 120
> > volts! When designing a current limiting inductor (or the primary of a
> > transformer) it is important that the inductors DC resistance be
> > significantly smaller than the inductors inductive reactance for it to pass
> > the required current.
> >
> 
> Remember, the dimentions were 6 x 12. To achieve the 790 turns on a coil this
> size as a single layer air-core coil appears to be a huge problem. This would
> take 70 turns per inch (27awg). This is also a whopping dc resistance of 766
> ohms. I doubt that the design would manage 20 watts.
> 
> However, isn't it possible (not practical) that the inductance of 0.0382H would
> be ok if the wire size was large enough? For instance a 24 x 60 geometry with 8
> awg. About a 700W capability? Huge I know, but theoretically?
> 
> Would a multi-layer "air-core" be more practical? It seems to me, the dc
> component would still pose a problem.
 
Actualy Bart, outside of using a ferro magnetic core, it would be quite 
unreasonable to try building a choke of such proportions!

                                       Sincerely

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