Patent ID: 6281615
Filing Date: 2001-08-28
Classification: H02K

Abstract:
An outer rotor type stepping motor comprisinga rotor having pole teeth of 12n.+-.2 on the inner peripheral surface thereof, where n is an integer and .gtoreq.1,a stator having three-phase stator windings of U, V and W, and 12 pieces of stator main pole arranged side by side and extending radially outwardly from an annular stator york, a plurality of pole teeth being formed on the tip end of each stator main pole, and a permanent magnet magnetized in the axial direction thereof and held between splitted stator elements, the stator windings of one phase being wound around every two stator main poles among the 12 pieces of the stator main pole, each of the windings being wound extending over the two splitted stator elements, wherein when the stator windings of one phase are excited with a direct current, 2 pieces of N pole and 2 pieces of S pole are formed on the 4 pieces of stator main pole.