| 摘要 |
<p>A motor includes a bearing holder axially extending in a substantially cylindrical shape and a surrounding member fixed to a radial outer surface of the bearing holder. The bearing holder includes a plurality of holder protrusion portions each having a radial outer surface at least partially making contact with the surrounding member and holder recess portions positioned radially inward of holder protrusion portions. The holder protrusion portions and the holder recess portions are alternately arranged along a circumferential direction. The central angle of a portion of an inner circumferential surface of the surrounding member remaining out of contact with each of the holder protrusion portions is equal to or larger than the central angle of a portion of an outer circumferential surface of a bearing unit.</p> |
