Thanks to 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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