The 9 coils (1,6mm wire) are cast into a disk that will be stationary. Around that disk, there will be 2 rotating parts with the magnets. More on that later! Firstly, a sneek peek of the coils being cast into polyester resin. A 500ml can with red-colored hardner was the cheapest at Amazon, only 12,56EUR!
Which becomes this after 24h of hardening: