Abstract
Fluid film bearings are widely used for HDD spindle motors due to high accuracy requirements. The study related to fluid film bearings has been actively conducted by many researchers, where recently optimum design of fluid film bearings which maximizes the stiffness and minimizes the friction torque is studied. On the other hand, it is estimated that because of its miniaturized design, even with a slight manufacturing error, the intended performance of the optimum design decreases. Therefore, it is essential to consider the dimension tolerance for optimum design of fluid film bearings. In this paper, the influence of bearing characteristic values upon the occurrence of the dimension tolerance by stochastic method with a 2.5"HDD spindle motors using fluid film bearing is conducted. As a result, the random variables are applied to high-influenced design variables for bearing performance, and optimum design with consideration of dimension tolerance is clarified.
