Patent ID: 6812599
Filing Date: 2004-11-02
Classification: H02K

Abstract:
A low-profile stepping motor comprisinga first unit including: a first upper stator yoke having a plurality of pole teeth formed along a semicircular inner circumference thereof; a first lower stator yoke having a plurality of pole teeth formed along a semicircular inner circumference thereof, the pole teeth of the first lower stator yoke meshing with the pole teeth of the first upper stator yoke; and a first coil unit fixedly sandwiched between the first upper and lower stator yokes, a second stator unit including: a second upper stator yoke formed as one piece integrally with the first upper stator yoke, and having a plurality of pole teeth formed along a semicircular inner circumference thereof; a second lower stator yoke formed as one piece integrally with the first lower stator yoke, and having a plurality of pole teeth formed along a semicircular inner circumference thereof, the pole teeth of the second lower stator yoke meshing with the pole teeth of the second upper stator yoke; and a second coil unit fixedly sandwiched between the second upper and lower stator yokes and arranged horizontally flush with the first coil unit, a rotor assembly rotatably disposed in a circular open space defined by the pole teeth of the first and second stator units; and a spacer block disposed between the first and second upper stator yokes and the first and second lower stator yokes, and adapted to surround the first coil unit, the second coil unit, and the pole teeth.