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

本研究的目的是利用提高流体膜轴承的角动刚度，为信息相关设备的薄型主轴设计提供指导。此外，还研究了角动刚度实验方法的建立。随着信息设备的小型化，用于硬盘等信息相关设备的主轴也被要求变薄。因此，提高液膜轴承的角动刚度是获得高旋转精度必须解决的重要问题。本文提出了在有限空间内布置轴承的优化方法，并结合滑动轴承和推力轴承进行了优化设计。结果表明，在薄型主轴情况下，提高推力轴承的角刚度是非常重要的。此外，利用所建立的实验方法进行的实验结果表明，陀螺效应引起的振动是显著的。

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.