height of the yoke 85 the central recess 52 39 39 of the disk 52 a central recess 83 39 of the printed circuit board 83 and a cylindrical hollow chamber 86 of the yoke 85 must be aligned with one another when these parts are joined together to enable introduction of the central stator parts the printed circuit board 83 is hereagain provided with connecting lines 84 for the power supply the disposition of the coils and their wiring can essentially be seen from fig5 a 5c in which the three possible phases are shown with phase offsets of 120 u00b0 each if the angle u03c6 0 u00b0 is defined for the phase shown in fig5 a then the phase in fig5 b is u03c6 120 u00b0 and the phase in fig5 c is u03c6 240 u00b0 the arrows in fig5 a 5c indicate the current flow direction in each case in the region of contact between adjacent coils through which current is flowing it can be seen that the current flow directions are opposed to one another and as a result the corresponding magnetic fields cancel one another the effect is as if adjacent coils through which current flows formed practically a single flow direction consequently each pair of adjacent coils can be considered the equivalent of one single coil which is true for the coil pairs 61.