Re: Current Limiting and Impedence

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Paul B. Brodie" <pbbrodie@xxxxxxxxxxxxx>

I read all of your posts and what I'm thinking so far is this:
TIG welder filler rod is available in low carbon mild steel in 36" rods of 
1/16" diam.,
soft iron coat hangers I have found are app. 30" long, once straightened 
out and app.between 1/16" and  3/32 diam. these are some "light duty" 
hangers I found that are thinner than standard ones, which are app. 1/8" diam.,
soft iron bailing wire is available in 500' reels for cheap and is less 
than 1/16" in diam.
It appears to me that the bailing wire is the best candidate in all 
regards, cost, soft iron, and diameter. With a diameter of less than 1/16", 
I would think the eddy currents would be minimal with each wire insulated 
from its neighbors. I can easily check the magnetism using some powerful 
neodym magnets I have on hand.

A very close friend of mine runs an automotive repair shop and he told me 
today that I can have all the dead alternators I want. He says most of them 
just have burned out diodes. I don't see that as a problem for this 
application.
Paul
Think Positive




----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Tuesday, May 10, 2005 3:40 PM
Subject: Re: Current Limiting and Impedence

> Original poster: Ed Phillips <<mailto:evp@xxxxxxxxxxx>evp@xxxxxxxxxxx>
>
> " > Original poster: "Paul B. Brodie" 
<<mailto:pbbrodie@xxxxxxxxxxxxx>pbbrodie@xxxxxxxxxxxxx>
>  >
>  > Gerry,
>  > When I was in Home Depot the other day looking for polyurethane, I
> noticed
>  > a bin full of all thread that also had many sizes of unthreaded steel
> rod
>  > as well. While going through some of the rods it came to me that I
> could
>  > fill a piece of PVC with a bunch of these rods to use as a core for
> an
>  > inductor, similar to a laminated core. I think I would probably need
> to
>  > insulate the rods from each other with varnish or polyurethane,
> right?
>
> Or plastic wrap.  Painting a bunch of rods is tough to do without
> leaving at
> least one spot that is bare."
>
> If the rods are of any size at all it probably won't due much good to
> insulate them from each other since most of the eddy current losses will
> be internal to the rods and not at their junctions.
>
> Ed
>
>