Abstract: A permanent magnet type stepping motor capable of exhibiting increased rotational angle accuracy and static angle accuracy minimizing a reduction in static torque. The permanent magnet type stepping motor includes a permanent magnet element having n (n: a positive integer of 4 or more) N magnetic poles and n S magnetic poles. A pitch between each adjacent two pole teeth of claw pole type yoke units is set to be constant. Magnetic center-magnetic center pitches between respective adjacent two of the n N magnetic poles and those between respective adjacent two of the n S magnetic poles are not set to be constant at 360°/n but defined to include two or more different pitches between more than 270°/n and less than 450°/n. Also, magnetic center-magnetic center pitches of respective adjacent two of the magnetic poles of the rotor are not set to be constant but defined to include two or more different pitches between more than 135°/n and less than 225°/n.

Abstract: A permanent magnet type stepping motor capable of exhibiting increased rotational angle accuracy and static angle accuracy. Claw pole type yoke units each include two yokes each provided with n (n: a positive integer of 4 or more) pole teeth. One of the yokes includes n/m pole teeth arranged in each of angular ranges of 360° /m (m: a divisor of n other than 1 and n). Pitches a between pole teeth positioned in each angular range are set to be within a range of (90° /n) [4−m/(n−m)] <a<(360° /n). A pitch b between two pole teeth positioned on both side of a boundary between each adjacent two angular ranges is set to be within a range of (360° /n)<b<(450° /n). The other yoke has pole teeth arranged between the pole teeth of the one yoke.