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Old 01-16-2015, 07:00 AM #1
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Default Running a 240V/50Hz MOT on 120V/60Hz

Forgive me for posting another one of these. I keep googling for this, but there are a lot of "build a 240V power supply" links and that isn't what I'm going for.

I'm thinking that one way of avoiding MOT core saturation would be to get a 240V/50Hz unit and run it on 120V/60Hz. Unless I'm mistaken, this would result in lower magnetic flux through the core due to twice as many turns/volt on the primary, and also due to the higher line frequency. The output voltage would also be halved, although I'm sure it would still be deadly.

The idea is that by doing this, the idle/magnetizing current would be lower. I think MOT idle current is normally 5 to 10 amps, which is wasteful and will ultimately overheat the unit.

Another thought is that if I rewind the secondary for low volts / high amps, more turns on the primary means more amps at the secondary for a given number of secondary turns.

Is any of this correct or am I way off in left field?


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Old 01-16-2015, 04:29 PM #2
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Default Re: Running a 240V/50Hz MOT on 120V/60Hz

To help with the mot's leakage inductance and saturation issues a good amount would be to wind at least 20 extra turns on the primary. This would allow you to remove those shunts. I heard it brings the magnetizing current to under 500 ma for adding 30 extra turns.

This will also increase your current output on the secondary and decrease voltage there as you said.

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