| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of magnetic noise by covering the outer side of a stator core with a hub which is integrally fitted to a rotary sleeve. SOLUTION: A hub part 16 is integrally fitted to the tip of a barrel part 15 in a rotary sleeve 13. The hub part 16 has a recessed part 21 covering the outer peripheral part of a stator core 18 fitted to a lower case 10. A circular magnet 22 is fitted to the rotary sleeve 13 through a rotor frame 47 formed of a magnetic material by making it face the tip 20 of the yoke 19 of the stator core 18 at the outer periphery of the barrel part 15. Since the stator core 18, a stator wire 27 and the magnet 22 become the inner side of the recessed part 21 of the hub part 16 and are covered, the hub part 16 is formed of a material by which magnetic shielding effect is expected, iron or aluminum alloy, for example. Thus, the occurrence of magnetic noise can considerably be reduced. |
