escribblings,

I've done some experimenting with inductive coupling, mostly of
the light-an-LED sort.

Resonance is the key - matching the frequency to the coils and
having identical coils (ie easiest way to get equal inductance)
does make a difference. I was using simple air coils, which
aren't terribly efficient. Conventional power transformers use
eg iron or ferrite of course which has higher permeability than
air to make a stronger magnetic flux for the secondary to
generate an EMF

https://en.wikipedia.org/wiki/Resonant_inductive_coupling

This page helped

https://sites.google.com/site/ddmcintosh2projects/inductive-charger

The spacing might not be too much of a problem. As you can see
in this video, the fields seem to localised enough to enable the
various "dancing" movements

https://www.youtube.com/watch?v=3D05gPzM7OJ34

Joe


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