This paper describes the robust optimum design considering dimensional tolerances for fluid dynamic bearings (FDBs) of 2.5 in. hard disk drives (HDDs). Recently, 2.5 in. HDDs are widely used for mobile devices such as laptops, video cameras, and car navigation systems. Therefore, in mobile devices, high durability toward external vibrations is essential for high HDD performance. On the other hand, FDBs for HDD spindle motors are generally manufactured by mass production processes which will eventually require reduction of production costs. Consequently, the FDBs are demanded to be easily manufactured and expected to have an insensitive design with low variability of bearing characteristics due to manufacturing errors. In this paper, first, the vibration model of the spindle motor is constructed, and then the vibration experiment was carried out in order to verify the appropriateness of the vibration model. Second, 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 the Gaussian distribution. The bearing characteristics are estimated by expectation and standard deviation. Finally, the results of this robust optimum design compared with ones of optimum design neglecting tolerance, and the validity of this technique, were clarified. It was found from the results that the tolerances of radial clearance and groove depth are important factors to be considered to reduce the variability of the amplitude and friction torque. In addition, the variability of the amplitude strongly depends on the groove depth.
Skip Nav Destination
e-mail: hiromu@keyaki.cc.u-tokai.ac.jp
Article navigation
October 2012
Applications
Robust Optimum Design of Fluid Dynamic Bearing for Hard Disk Drive Spindle Motors
Hiromu Hashimoto,
e-mail: hiromu@keyaki.cc.u-tokai.ac.jp
Hiromu Hashimoto
Professor
Tokai University
, 4-1-1 Kitakaname, Hiratsuka-shi Kanagawa-ken, 259-1292, Japan
Search for other works by this author on:
Masayuki Ochiai,
Masayuki Ochiai
Associate Professor
Tokai University
, 4-1-1 Kitakaname, Hiratsuka-shi Kanagawa-ken, 259-1292, Japan
Search for other works by this author on:
Yuta Sunami
Yuta Sunami
Graduate Student
Tokai University
, 4-1-1 Kitakaname, Hiratsuka-shi Kanagawa-ken, 259-1292, Japan
Search for other works by this author on:
Hiromu Hashimoto
Professor
Tokai University
, 4-1-1 Kitakaname, Hiratsuka-shi Kanagawa-ken, 259-1292, Japan
e-mail: hiromu@keyaki.cc.u-tokai.ac.jp
Masayuki Ochiai
Associate Professor
Tokai University
, 4-1-1 Kitakaname, Hiratsuka-shi Kanagawa-ken, 259-1292, Japan
Yuta Sunami
Graduate Student
Tokai University
, 4-1-1 Kitakaname, Hiratsuka-shi Kanagawa-ken, 259-1292, Japan
J. Tribol. Oct 2012, 134(4): 041102 (11 pages)
Published Online: August 23, 2012
Article history
Received:
July 8, 2011
Revised:
July 11, 2012
Online:
August 23, 2012
Published:
August 23, 2012
Citation
Hashimoto, H., Ochiai, M., and Sunami, Y. (August 23, 2012). "Robust Optimum Design of Fluid Dynamic Bearing for Hard Disk Drive Spindle Motors." ASME. J. Tribol. October 2012; 134(4): 041102. https://doi.org/10.1115/1.4007246
Download citation file:
Get Email Alerts
Cited By
Related Articles
Experimental Determination and Analytical Model of Friction Torque of a Double Row Roller Slewing Bearing
J. Tribol (March,2017)
The Influence of Surface Patterning on the Thermal Properties of Textured Thrust Bearings
J. Tribol (November,2018)
Power Efficiency of the Rotational-to-Linear Infinitely Variable
Cobotic Transmission
J. Mech. Des (December,2007)
Rotating Loosening Mechanism of a Nut Connecting a Rotary Disk Under Rotating-Bending Force
J. Mech. Des (November,2005)
Related Chapters
Stable Analysis on Speed Adaptive Observer in Low Speed Operation
International Conference on Instrumentation, Measurement, Circuits and Systems (ICIMCS 2011)
Materials
Design and Application of the Worm Gear
Reduction of Cogging Torque in Permanent Magnet Motor Based on the Pole Width Modulation Method
International Conference on Mechanical and Electrical Technology, 3rd, (ICMET-China 2011), Volumes 1–3