Motor details links

Nice technical analysis of a motor. Follow links for some nice 128 pole encoder details. From there: Motor is 27N30P - equivalent to 9N10P? This means it has 9 windings for each set of 10 magnets, and 30 magnets total, hence our 90 hall positions.

Nice winding visualisation/calculator.

Old STM document on BLDC & PMW on STM32.

STM application note on timers & PWM.