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Thanks! glad you liked it!The coil does not have to be perfectly round, but that might affect its efficiency.In fact, in many other applications that use this technology (i.e. RFID, NFC etc.) the coil is rectangular. i guess you can shape it as you wish as long as it's looped around.You might want to do some experiments and see how this affects the energy transfer.regarding the position, it works within a small tolerance of movement. this is why these chargers have magnets to align the phone.I saw some commercial chargers that use 3 coils instead of one to allow for more flexibility in positioning the phone on the charger. maybe a bigger coil would help too, I'm not sure.
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