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

Original poster: "Wilson Ng" <metalstorm2002@xxxxxxxxxxx>


Actually I'm winding less turns on the primary. I use a US MOT and I guess it originally had around 150-250 turns. The huge number of turns on the original primary didn't work with my 600w dimmer/10 mf cap setup, so I had to rewind it. Why does a few number of turns make my transformer ineffective? I've read somewhere that a transformer requires a minimum of x turns per volt. If I were to apply very low voltage AC to the filament winding, then it would be okay. This rule probably only applies to iron core transformers.

From: "Tesla list" <tesla@xxxxxxxxxx>
To: tesla@xxxxxxxxxx
Subject: Re: MOT with chopped off primary -- Anyone tried this before?
Date: Tue, 05 Jul 2005 14:57:45 -0600

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

I'm sorry but I don't understand whether you are winding more or less turns on the primary. You just say that you wound 30 turns. Also, why would too few turns make the transformer ineffective. Can you explain, please? One other thing, are you using a MOT designed for 240 volts, like in the UK or 120 volts, like in the US? Regards.
Paul
Think Positive

----- Original Message -----
From: "Tesla list" <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
To: <<mailto:tesla@xxxxxxxxxx>tesla@xxxxxxxxxx>
Sent: Monday, July 04, 2005 10:09 PM
Subject: MOT with chopped off primary -- Anyone tried this before?

> Original poster: "Wilson Ng" <<mailto:metalstorm2002@xxxxxxxxxxx>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?
>
> _
>