| 摘要 |
PURPOSE: A fluid dynamic bearing device used together with disk drive memory device products with revolutions per minute (RPM) regularity in a fixed range is provided to be used for reducing production costs of 2.5 inch notebook products which are marked as standard performance products with 5400 RPM or high performance products with 7200 RPM. CONSTITUTION: A fluid dynamic bearing device includes a static unit, a rotatable unit, and a fluid dynamic bearing. The static unit comprises a first stator or a second stator, and the first stator includes more coils than the second stator. The first stator includes a sleeve (204) and a static winding unit (211) which adhere to a base (220). The rotatable unit includes a shaft (202) and a hub (210). The fluid dynamic bearing is formed by the static unit and the rotatable unit. |
