I sure hope they're well embarrassed for claiming to have invented
anything in that area. How much funding do you suppose it will get
them?
BTW, I believe it stated in that very article (which I don't at all
blame you for not reading in its entirety) that efficiency was on the
order of ~42%, and that they'd have to spend two to five years working
on it in order to double it to a useable level.
Maybe for their next trick they'll reinvent AC.
Hello,
I tried to calculate some numbers and here are my results.
As supposed by the "inventors", the coils are used in resonant mode
at medium wave frequency (1MHz or higher). Only the B-field
is used to transfer power.
A reasonable effeciency will require a high Q of let's say 1000. This
also means you have to tune the resonance frequeny of your receiver
coils with high precision, e.g. 0.2e-3.
The sender coil has an unductance of some ten mirco Henries.
By the way the coupling factor is in the range of 1e-4 to 1e-3 in the
proposed distance with a receiver coil of the same dimensions as the sender
coil.
The voltage along the coil maybe Kilovolt(s) due to the resonance.
This means strong E-fields close to the coil too.
It's true that the unwanted transferred power into non-tuned loops can
be neglected regarding power in the proposed distance. This may not
be true very close to the coil.
The B-field is below the earth magnetic field but it's alternating with MHz.
So it doesn't make sense to compare it this way regarding the possible
effcts
to humans and devices.
Who wants very strong E-fields and B-fields close to the coil in a living
room?
Best regards
Helmut