Patent ID: 6727608
Filing Date: 2004-04-27
Classification: H02K

Abstract:
A claw-pole type stepping motor comprising:a stator in which coils are arranged; a yoke unit made of soft magnetic steel and consisting of an inner yoke and an outer yoke, each inner yoke and outer yoke having a round hole at its center, and opposing pairs of inner and outer pole tooth sections made of soft magnetic steel thereby forming a magnetic circuit; each of said opposing pairs of pole tooth sections being prepared discretely by punching out a soft magnetic strip steel plate so as to form a toothed piece which has a belt portion and a plurality of pole teeth arrayed in a straight line in a longitudinal direction of said belt portion at a regular interval and integrally connected to said belt portion and then by rolling said toothed piece into a cylindrical shape with its both ends detachably jointed to each other at a joint to dispose said opposing pairs of pole tooth sections in a corresponding cylindrical shape; and, a rotor magnet rotatably disposed opposite to said pair of pole tooth sections of said stator.