| 摘要 |
<p>PURPOSE:To fix an armature having no bridge part using only adapter by providing an outer hub with an outside fixing part to fix an outer peripheral part of the armature and an inside fixing part to fix its inner peripheral part, and bending the inside fixing part inward at proper spots. CONSTITUTION:An outer hub is provided with a convex part 13a to fix an outside pole 5b of an armature 5 and a protruding part 13c to fix its inside pole 5a. The armature 5 which has only an outer hub 13 and magnetic cutting off holes 10 formed over its whole periphery can therefore be used without increasing the number of parts. Thus, since a bridge part can be omitted, magnetic leakage from the bridge part does not occur, and magnetic performance can accordingly be improved. In addition to that, since the armature 5 is fixed only by the outer hub 13, the vibration of an inner hub 11 can be controlled to more reduce noise due to operation in comparison with a case where other members are used.</p> |
