Re: Early Unusual Transformer Design
Ah, but this configuration isn't open-ended, it's still a closed iron path with the ends of the wires going through the winding's centre pole bent around the outside so they overlap.
(True mains transformers with a magnetic path completed by air do exist, but they are very few and far between. Coupling between primary and secondary is crummy, and the huge number of turns needed to get sufficient inductance to stop the no-load current being Sky-high means that winding resistances are large).
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