PCB Motor - Why Are Wedge Coils Better Than Round Coils_

Thanks to https://www.PCBWay.com/?from=atomic for supplying the PCBs used in this video. We're getting somewhere with the PCB motor - it spins pretty fast - but we're more interested in torque. There's been an interesting question from the viewers - why use a wedge-shaped coil? Surely a spiral coil is better. Let's try and answer this question with a bit of science!