Dan Zimmerman N3OX wrote:
>> So what you're building is basically a transformer with two coupled
>> windings, so the core has to carry the whole flux.
>
>
> No, cancellation is cancellation.
Yes, but consider this.. A long bar of iron. One winding on one end,
the other winding on the other.
There's no net flux, but the flux has to travel through the core to
actually be cancelled (whether you conceptualize it as cancelling at the
mid point, or sort of uniformly along the entire distance, or just as
the superposition of the two fluxes).
The inevitable loss in the core is why power transformers with
overlapped or interleaved windings are more efficient than those with
the windings separated (say, for HV insulation). (aside from the
increased leakage inductance, which is another issue, but which is small
for well designed line frequency transformers, even for HV isolation)
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