| 摘要 |
PROBLEM TO BE SOLVED: To prevent the efficiency of a motor from declining. SOLUTION: The motor 1 has a field 2 and armatures 11 and 12. The field 2 has a plurality of pole faces 241 and 242, respectively, on the outer circumferential side surface and the inner circumferential side surface. The armature 11 has a plurality of teeth 111 arranged on the outer circumferential side of the field 2. The armature 12 has a plurality of teeth 121 arranged on the inner circumferential side of the field 2. The ratio of the minimum area of cross-section for the direction 93 of the teeth 111 to the minimum area of cross-section for the direction 94 of the teeth 121 is substantially identical to the ratio of the area of the pole face 241 to the area of the pole face 242. COPYRIGHT: (C)2008,JPO&INPIT
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