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Design of Performance Evaluation System and Measurement of Dynamic Behavior for Fluid Hydrodynamic Bearing in HDD  

Kang, Jung-Woo (Graduate School of Mechanical Engineering, Chungju National University)
Lee, Tae-Whi (Psylogic, Inc.)
Lee, Hyoung-Wook (Department of Energy System Engineering, Chungju National University)
Park, Sung-Jun (Department of Mechanical Engineering, Chungju National University)
Publication Information
Journal of the Korean Society for Precision Engineering / v.28, no.10, 2011 , pp. 1159-1165 More about this Journal
Abstract
The recording density of HDD is increasing in ratio of 100% each year. Because the increasing of recording density requires the feature of high rotation, fixation and low-noise, fluid hydrodynamic bearing(FDB) has been paid attention to overcome a limitation in ball bearing. Most of researches related to improving performance of FDB have been studied in Japan which has 80% more market share of HDD spindle motor assembly. Main subject of studies are about for the design of the groove shape, manufacturing process of fluid dynamic bearing, performance evaluation and measurement. In HDD, non-repeatable runout(NRRO) is most important parameter which determines the performance of HDD spindle system because NRRO is unpredictable that cannot be compensated in head/slider servo system. In this study, performance evaluation system can measure dynamic behaviors were designed and methodology for calculating imbalance, RRO, and NRRO were proposed.
Keywords
Runout; RRO; NRRO; Balancing; Fluid Hydrodynamic Bearing; Imbalance;
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