The basic idea of gears is to convert mechanical power from any rotational speed and torque to another speed and torque and mechanical gears use the physical-contact gear engagement for that. But how about instead of physical contact meshing, a non-contact magnetic meshing by permanent magnets?
Let's make a prototype!
https://www.youtube.com/watch?v=DAWVetrtD9U
marvellous .. STL files?