Re: MOT with chopped off primary -- Anyone tried this before?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Gregory Hunter <tesla_39560@xxxxxxxxx>

Yeah, I once chopped off a MOT primary and rewound it
with half as many turns. I used a dimmer & motor run
cap to pulse it. It was sort of like an ignition coil
on steroids. Very nice arc--nice & hot. Mine didn't
last long enough to become part of a TC power supply.
It died of internal arcing with less than an hour of
run time on it. The principle was sound though. Just
needs tougher insulation.

Greg

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "Wilson Ng"
> <metalstorm2002@xxxxxxxxxxx>
>
>
>
> Hello. I've read an old posting about connecting the
> filament winding of a
> MOT to  a light
> dimmer/capacitor combination. It worked for me.
> However I've found that
> increasing the
> capacitance dosen't increase the output power of the
> MOT that much. I
> suspect that the filament
> winding has too few turns to be effective.
>
>    Then I painstakingly removed the primary and
> rewound it with 30 turns of
> #18 stranded wire.
> When used with the dimmer/capacitor setup, it worked
> much better. The MOT's
> output power is
> now equivalent to that of my ignition coil when a 10
> mf cap is used. With
> this output power,
> my very crude and tiny tesla coil was able to
> produce up to 3" sparks. The
> only problem is
> internal arcing, which I've encountered several
> times when I adjusted the
> spark gap too wide.
> One thing I don't understand is why is there no
> internal arcing when the
> MOT's output is
> shorted with a .25" spark, but when it is used to
> power my tesla coil, a
> gap of this width
> causes internal arcing? Is it possible to solve this
> problem by
> disconnecting the end of the
> MOT's secondary winding that connects to its core?
>
> _
>
>
>


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