rotor angle 0°electrical angle 0°current frequency 0 Hz
N: magnet, or a tooth driven northS: magnet, or a tooth driven southCoils carrying current (dots: phase A, B, C)Twelve teeth, fourteen magnets, three phases. There are no brushes, so the drive switches the current itself. It feeds the three phases sine waves 120° apart, timed to the rotor's angle, so the stator's field always sits a quarter of an electrical cycle ahead of the magnets and keeps pulling them forward. With 7 pairs of magnets the currents go through 7 cycles per turn. Watch the coloured teeth: with this winding the field pattern turns 7 times faster than the can, and backwards.