| 摘要 |
PROBLEM TO BE SOLVED: To provide a yoke structure of a small inner rotor type motor which can enhance the efficiency of a magnetic circuit without complicating the assembling of a stator. SOLUTION: A bent part 1b having a predetermined width is formed on the entire outer peripheral end of a ring 1a at an upper yoke 1, and a slit 1c is provided between the bent part 1b and the ring 1a. A supporting part 1d is projected from the inner peripheral end of the ring 1a, and a bent part 1e is formed in an opposite shape at its end. A lower yoke 3 is similarly constituted. A pair of the bent parts 3e of the lower yoke 3 and a pair of the bent parts 1e of the upper yoke 1 have a positional relationship deviated at 90°in a circumferential direction. A coil 2 is placed on the ring 3a of the lower yoke 3 and is assembled by engaging the upper yoke 1 from above. COPYRIGHT: (C)2004,JPO&NCIPI
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