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Re: MOT current limiting reactor

Original poster: "resonance" <resonance@xxxxxxxxxxxx>

Slightly less eddy currents. We usually don't bother, but you can get even more efficiency if you spray some insulation on each wire --- reduces eddy and cross currents in the bundle.

How many turns did it require and to what kVA level (or current level) did it control your pole xmfr?


Dr. Resonance

I made two of your inductors for my pig power. I used 3/8" mild steel and a
surprising number (I think 75) fit in each 3" pipe. I stood mine on end,
plugged bottoms, and filled with 2 part Marine epoxy. Never raised above 20
degrees F (measured) with 15KW of water heater elements. I suppose the 1/8"
would run cooler still?

Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Sunday, January 07, 2007 3:13 PM
To: tesla@xxxxxxxxxx
Subject: MOT current limiting reactor

Original poster: "resonance" <resonance@xxxxxxxxxxxx>

One of the problems you are having is that no univ. would know the
hysteresis curves for the steel you intend to use so they have no way
to predict the current limiting ability of the reactor.

We use 1018 CRS (cold rolled steel) in 1/8th inch thickness.  Easy to
cut fast with a "chop saw" abrasive cutoff wheel.

A 3 inch ID PVC tube approx 30 inches long, fill with 1/8 inch cut
steel rod CRS 1018) x 29.75 inches long, and wind 400 turns of #12 AWG wire.
You can tap the winding every 50 turns to adjust the current level
where you need it.  We usually tap above 200 turns.  RTV silicone in
place inside the tube and add 1/8th phenolic or PVC endcaps ---
silicone in place.

Dr. Resonance

>Thanks for the "primer" on MOT
>As I will construct a power supply from my MOT eventually .... can
>anyone help with how to determine the size of ballasts ... I have
>e-mail 4 UK universities and spent 50 or so hours surfing for
>information but still do not understand how to determine their size
>( can one measure inductance with simple equipment ? ... i.e NO scope)
>James Howells   ( England )
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