Abstract
This paper describes the robust optimum design considering dimensional tolerance for fluid dynamic bearings (141)Bs) of 2.5" hard disk drives (HDDs). Recently, 2.5" HDDs are widely used for mobile devices such as laptops and video cameras. Therefore, in mobile devices, high durability towards external vibrations is essential for high HDD performance. In addition, the bearings are demanded to high processing accuracy due to small size of bearings. However, there is a problem which high processing accuracy is very expensive because the bearings of HDD are manufactured by mass production process. In this paper, robust design introduces the analysis of bearing characteristics which is effective to maintain performance when the manufacturing errors occurred. The bearing characteristics are calculated considering dimensional tolerance using optimum design combined with the statistical method in which the dimensional tolerance is assumed to distribute according to normal distribution. The bearing characteristics are estimated by expectation and standard deviation. As a result, bearings with high performance and low variability can be obtained compared with optimum design neglecting dimensional tolerance.
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