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Registered Member #1497
Joined: Thu May 22 2008, 05:24AM
Location: Toronto, Ontario, Canada
Posts: 801
So a week ago I built a power supply using a MOT re-wound for low voltage, the magnetizing current with no load is about 4A input, rising to 5A under full load. Unfortunately the voltage drops too low under full load (30A). I left the shunt in the MOT at the time when I re-wound it. The core is probably 500W, maybe a little more.
What I'm wondering is what will happen if I remove the shunt.
Will the unloaded magnetizing current decrease, and maximum load current increase? or Will the unloaded magnetizing current increase, and maximum load current increase?
At the moment the PSU works fine, but I'd be worried if the magnetizing current significantly increases since the primary wire isn't rated for much more current...
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
It does increase, because with the shunts in, some of the magnetic flux is "forced" through the shunts (because its already stupidly high), removing them makes things even worse.
What you can do is remove the shunts, and then wind some extra primary turns in their place.
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Microwave oven transformer magnetizing current?
