| 摘要 |
A motor including a magnet, an armature, a common brush, a low-speed drive brush, and a high-speed drive brush is disclosed. The magnet forms four or more magnetic pole portions. The armature includes a rotation shaft, an armature having fourteen teeth, a coil wound around the teeth, and a commutator having fourteen segments arranged in a circumferential direction of the rotation shaft. The common brush, low-speed drive brush, and high-speed drive brush are spaced apart and arranged in the circumferential direction of the rotation shaft and each have a width in the circumferential direction of the rotation shaft. The number of teeth is the same as the number of segments. When P represents the number of magnetic pole portions of the magnet and S represents the number of teeth, (2S/P) is an odd number. The width of each brush and the location of the brush in the circumferential direction are set so that the three types of brushes, which are the common brush, the low-speed drive brush, and the high-speed drive brush, all do not simultaneously short-circuit two of the segments that are adjacent to each other in the circumferential direction.
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