A stator of the stepping motor of the invention includes an annular shaped yoke portion, a stator iron-core having twelve stator main poles each having a plurality of small teeth on the tip end thereof and stator coils wound in the stator iron-core as three-phase winding. The stator rotatably supports...http://www.google.ca/patents/US6707178?utm_source=gb-gplus-sharePatent US6707178 - Permanent magnet type twelve-pole stepping motor
