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Registered Member #3610
Joined: Thu Jan 13 2011, 03:29AM
Location: Seattle, WA
Posts: 506
Mads Barnkob wrote ...
The shunts are extra core material that will absorb some of the magnetic flux induced in the transformer by the primary windings, effectively lowering the amount of current that can drawn from the secondary, thus protecting the primary winding. If you remove them and later add them again, remember to maintain the same isolation between shunts and transformer.
A MOT is by design on the edge of self destruction, leaving in the shunts will make you able to have longer run times but with lower secondary output current, wise versa without shunts.
They don't absorb it, they shunt it, bypassing the part of the core with the secondary winding. If you're rewinding it for a low voltage power supply you will definitely want to remove them unless you want it to be current limited.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
The shunts in a MOT add leakage inductance, which appears in the circuit as a series inductance.
If you want this series inductance, then leave them in. If you don't, then take them out. Do you want extra series inductance?
As a hint, you probably don't. To get maximum current in your low voltage output winding, you need minimum series impedance.
Why does a MOT have them then? a) to neutralise some of the series C in the voltage doubler, which *improves* the output impedance and b) to improve the power factor resulting from intermittent conduction of the diodes - always a handy hack if you are running a lot of power into a rectifier. So if your rewound MOT is going to be driving a bridge rectifier, like a plating bath, you may want to leave them in.
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MOT high current secondary. Shunts?
