Journal of the Korean Society for Precision Engineering (한국정밀공학회지)

Korean Society for Precision Engineering (한국정밀공학회)
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Design of Performance Evaluation System and Measurement of Dynamic Behavior for Fluid Hydrodynamic Bearing in HDD

HDD용 유체동압베어링 성능평가 시스템 설계 및 동적거동 측정

  • 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)
  • 강정우 (충주대학교 기계공학과 대학원) ;
  • 이태휘 ((주)사이로직) ;
  • 이형욱 (충주대학교 에너지시스템공학과) ;
  • 박성준 (충주대학교 기계공학과)
  • Received : 2011.05.09
  • Accepted : 2011.07.12
  • Published : 2011.10.01
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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

References

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