Axial Flux PCB Motors - Wedge or Spiral Coils - Which is best? I've delved deep into the reason why people prefer to use wedge-shaped coils when building PCB motors. After a lot of Googling, a bit of Python scripting, and a ton of visuals, what emerged was a very compelling argument for the humble wedge coil. Turns out, radial lines are the heroes in the story – the more the merrier – because these are what generate the fields in the correct direction to crank up the torque. Don’t get too attached though; there may be alternative, more efficient coil designs yet to discover, but those are topics for another day! 20 November 2022