Patent ID: 6744156
Filing Date: 2004-06-01
Classification: H02K

Abstract:
A stepping motor comprising:a plurality of coils for switching a direction of magnetism generated by switching electrification; a stator including a plurality of stator iron cores, for forming a magnetic pole by integrating magnetism generated by each of the coils; a rotor adapted to hold a permanent magnet, and rotated by attraction/repulsion between the permanent magnet and a magnetic pole of each of the stator iron cores; a housing provided to integrally cover the stator and the rotor; and an output shaft gear formed in an output shaft of the rotor, and connected to a gear to be driven, of a member to be driven, wherein the number of teeth for the output shaft gear is set to a predetermined ratio with respect to the number of magnetically stable points per rotation of the rotor, in order to hold said member to be driven in a reference position when the coil is electrified by a regulated electrification pattern.