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Registered Member #3395
Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
I was wondering what actually would happen to the output of a MOT (and the MOT itself) if you did either of these options:
1. Connect the high current tap in series with the HV winding,
or
2. Connect the the two high current and HV windings in parallel.
Apart from possibly providing a much higher current output (therefore bigger arcs) I would expect something to get fried very quickly. For option 2, would phasing be necessary in order to prevent short-circuit on the windings?
Registered Member #3395
Joined: Thu Nov 04 2010, 08:42AM
Location: Christchurch, New Zealand
Posts: 193
Yeah, that's pretty much exactly what I thought. I wouldn't really care if one of my crappy MOTs saturated to death. For option 1, would the arcs become huge due to the high current?
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
What do you mean by "high current tap"? If you mean the filament winding and connected it in series with the secondary, the output voltage would be just a few volts higher (or lower depending on phasing). The output current would be almost the same (the impedance of the HV winding is dominant). If you connected the two windings in parallel, it would be just almost a perfect short circuit for the HV winding and the MOT would overheat quickly. The output voltage in this case would be a few Volts from the filament winding.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I assume you're thinking about ways to superimpose one onto the other, as in HF TIG welder supplies.
I think you'd need a second transformer, with a 1:1 ratio, or whatever, and with windings able to take the current, but I'm still not sure if this would work.
Maybe someone else can comment?
(HF TIG welders use an air core transformer with 'loose' coupling, and one frequency much higher than the other. You'd be better off superimposing the output from a small SGTC circuit onto the 50Hz output from your MOT, I think)
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MOT Question
