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ballast Inductor Choke coil (fwd)
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From: Barton B. Anderson [SMTP:mopar-at-mn.uswest-dot-net]
Sent: Wednesday, April 15, 1998 12:42 AM
To: Tesla List
Subject: Re: ballast Inductor Choke coil (fwd)
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.
|_Bart_|