Enhancement of angular dynamic stiffness utilizing optimum layout and development of thin type spindle

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The aim of this study is to provide a design guideline for a thin type spindles for information related equipments using the enhancement of angular dynamicstiffness on fluid film bearings. In addition, establishment of experimental method of the angular dynamic stiffness was investigated. The spindles used in information related equipments such as Hard Disk Drives are required to become thinner with thinning the information related devices. Consequently, enhancement of angular dynamic stiffness of the fluid film bearings is important problem should be solved in order to obtain high rotational accuracy. In this study, we develop the optimization method to lay out the bearings in a limited space and carried out the optimum design combined with journal bearing and thrust bearing. As a result, it was found that enhancing the angular stiffness of the thrust bearing is important in case of thin type spindles. In addition, from the result of experiment by using the established experimental method, it was found that the vibration caused by gyroscopic effect is significant.