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!

0:00 Why are we here?
1:13 Why not just use a spiral - the intuitive explanation
1:47 What kind of forces are we trying to generate?
2:00 Simulating the magnetic field from our coils
4:25 Simulating the force produced by the magnet on our coils

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