I created two flat wound-spiral coils (also known as bifilar coils). The transmitter coil I made with an outer diameter of 10 inches and an inductance of 3 mH. The receiver coil I used a much smaller wire diameter, so it is only 4 inches but also 3 mH. These coils will be used for charging a 12 V battery using a 15 V source on the transmitter, so there is not much room for high losses.
They are going to be transferring power through an air gap of about 2 inches. I am wondering if I should try putting one at an angle to the other to try to get the best through-put. I do not have the rest of the circuitry prepared so I cannot test by trial and error yet. Until then I was wondering if anyone could recommend the best positioning.
I do not take credit for this image; I got it at the website https://www.wibotic.com/wireless-power/
Recommendations would be appreciated. Cheers.