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Identification Method of Dynamic Coefficients of Fluid Film Bearings for HDD spindle motors

Journal of Mechanics Engineering and Automation 2014年第2期4卷 123-129页

作者： Masayuki Ochiai Yuta Sunami Hiromu Hashimoto Department of Mechanical Engineering Tokai University Hiratsuka 259-1292 Japan

Fluid film bearings are widely used as support elements of rotating shaft for HDD （hard disk drive） spindle motors. Recently, the opportunity for the HDD spindle motors exposed to external vibration has been increasing because the HDDs are used for various information related equipments such as mobile PCs, car navigation systems. Hence, the rotating shaft has a possibility to come in contact with the bearing and it causes wear or seizure to the bearing surface. In order to avoid the problems, it is extremely important to enhance the dynamic characteristics of the fluid film bearings for spindles. However, verification from both theory and experiment of dynamic characteristics such as spring coefficients and damping coefficients is rare and few. In this paper, the bearing vibration characteristics when the HDD spindle is oscillated are investigated theoretically and experimentally. And then the identification method ofoil film coefficients of fluid film bearing spindles is described.

关键词： Tribology fluid film bearing hard disk drive spindle motor dynamic coefficient vibration identification.

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Vibration Response Characteristics against the Radial and Axial Shocks on Small Size Hard Disk Drive spindle Supported by Oil Film Bearings

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Journal of Mechanics Engineering and Automation 2014年第7期4卷 547-554页

作者： Masayuki Ochiai Yuta Sunami Hiromu Hashimoto Department of Mechanical Engineering Tokai University Kanagawa 259-1292 Japan

This paper describes the experimental study on shock response of FDB （fluid dynamic bearing） spindle for HDDs （hard disk drives）. The FDBs are widely used as rotating shaft support elements for HDD spindle motors. Recently, the opportunity for the HDD spindle motors exposed to external vibration has been increasing because the HDDs are used for various information related equipment such as mobile PCs （personal computers）, video cameras, car navigation systems and so on. Hence, the rotating shaft has a possibility to come in contact with the bearing by external shocks and it causes wear or seizure to the bearing surface. To avoid the problem, it is extremely important to know how the spindle moves against the large shock on HDDs experimentally. However, as far as the authors know, there are few experimental studies treating the shock response of HDD spindles. In this paper, firstly, we propose a new test rig and experimental method for shock response of FDB spindles. Then the shock tests against the radial and axial disturbance on FDB spindle for 2.5＂ HDD are conducted. Finally, the experimental results of shock response waveforms and maximum displacement of disk are shown.

关键词： Tribology fluid film bearing hard disk drive spindle motor shock test shock response

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