The figure below shows a BLDC motor (TSDZ2 Ebike Motor). It has 18 stator windings (3 phase -> 3 pole pairs per phase) and 16 poles on the rotor. What are possible reasons for this design? Why is a lower pole count on the rotor beneficial?
Is my assumption correct that the ratio between electrical and mechanical revolutions is given by the rotor pole count? In this case there would be 8 electrical cycles per mechanical revolution.