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Well it turns out that the relative position of coils does affect the coupling. Coils are coupled if in-line or side by side. I'm not sure what rx and tx are, but if one of the transmitter coils is orthogonal to another, they are mutually decoupled and tuned to the same frequency and...
As I said, going from single phase from polyphase could allow a lower frequecy to be used, as the power transfer is constant, and a lower frequency increases coupling distance.
If each transmitter coil is exactly opposite each reciever coil, or at least considerably closest to one of the receiver coils, then I'm sure it would work. If possible a polyphase inductive power transfer would seem more promising because the inductive power transfer can be constant, rather...
All induction lights run on AC of course, but could polyphase be used? Such as if you have multiple induction lights in a room and run each one off a separate phase.
Re: Tri color LED
No, it's not really a tri-color LED, it relies on persistence of vision to produce the sensation of yellow, it does not (as far as I know) produce yellow light as saturated as a true yellow LED.
One could design traffic lights using such LEDs too, and it would work for anyone...
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