| 摘要 |
A stepping motor includes a rotor having a cylindrical permanent magnet, ring-shaped first and second yoke units that are arranged so as to be mutually stacked along an axis of the rotor, and a pair of lid members that enclose the first and second yoke units and support the rotor so as to be rotatable around the axis. Each of the first and second yoke units includes a ring-shaped exciting coil, an outer yoke that includes an outer cylindrical section that accommodates therein the exciting coil, a back face section, and magnetic pole teeth, and an inner yoke that is combined with the outer yoke and includes a ring-shaped ring section formed around the axis, and magnetic pole teeth that are arranged at fixed intervals while alternating at equal intervals in a noncontacting state with respect to the magnetic pole teeth of the outer yoke. The first and second yoke units are stacked while the back face sections thereof are in a mutual surface contact state.
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