| 摘要 |
A stepping motor 10 having a configuration which includes: a rotor 14 constituted by a rotor magnet 14b magnetized circumferentially; a stator 13 constituted by a plurality of phases of stator yokes 16a to 16h arranged side by side in an axial direction of the stepping motor so as to surround the rotor, and coils 17a to 17d wound in coil winding portions defined by the stator yokes; an armor member 11, 12 for holding the stator yokes with respect to the axial direction of the stepping motor; and each phase of the stator yokes being constituted by a pair of stator yokes on which magnetic pole teeth of plural phases arranged annularly are combined alternately; wherein the stator yokes are arranged so that every two phases of the stator yokes are paired to form an even number of sets of stator yokes; wherein two phases a and b and c and d in each set of the stator yokes are reverse to each other; and wherein coils 17a and 17b and 17c and 17d provided on the two phases of stator yokes in each set are connected to generate magnetic fields in series and in reverse to each other.
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