한국소음진동공학회논문집 (Transactions of the Korean Society for Noise and Vibration Engineering)

  • 제16권1호
  • /
  • Pages.12-18
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  • 2006
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  • 1598-2785(pISSN)
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  • 2287-5476(eISSN)
한국소음진동공학회 (The Korean Society for Noise and Vibration Engineering)
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스핀들 회전축계의 기전 연성 해석을 이용한 모바일 HDD의 자유 낙하 특성 및 감지에 관한 연구

Characterization and Detection of a Free-falling State of a Mobile HDD Using the Electromechanical Analysis in a Rotating Spindle System

  • 박상진 (한양대학교 정밀기계공학과) ;
  • 장건희 (한양대학교 기계공학부) ;
  • 김철순 (삼성종합기술원 storage Lab.) ;
  • 한재혁 (삼성종합기술원 storage Lab.)
  • 발행 : 2006.01.01
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초록

This research investigates the electromechanical characteristics of a spindle motor in a free-falling mobile hard disk drive before unexpected shock. Electromechanical simulation includes a time-stepping finite element analysis of the magnetic field in a speed controlled brushless DC motor and dynamic analysis of the stationary and rotating part linked by the fluid dynamic bearing under the free-falling condition. Analysis results show that the dynamic characteristics of the rotating spindle system during free-falling state have an effect on the relative motion between the stationary and rotating part of HDD. It results from the variation of reaction force in the bearing area due to the gravity force exerted on the rotating part of HDD, and the free-falling condition can be detected by observing the signal of the spindle motor and disk-head interface without using an accelerometer.

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참고문헌

  1. Jayson, E. M., Smith, P. W. and Talke, F. E., 2003, 'Shock Modeling of the Head-media Interface in an Operational Hard Disk Drive,' IEEE Transactions on Magnetics, Vol. 39, No. 5, pp. 2429-2431 https://doi.org/10.1109/TMAG.2003.816427
  2. Edwards, J. R., 1999, 'Finite Element Analysis of the Shock Response and Head Slap Behavior of a Hard Disk Drive,' IEEE Transactions on Magnetics, Vol. 35, No. 2, pp. 863-867 https://doi.org/10.1109/20.753799
  3. David, H. Jen, Mike Suk, 2000, 'Method and Apparatus for Unloading Head from Disk before a Shock to a Disk Drive System,' United States Patent. No. 6,101,062
  4. Jang, G. H. and Part, S. J., 2005, 'Sensorless Detection of a Free-falling HDD by Electromechanical Signal of a Spindle Motor,' IEEE Transactions on Magnetics, will be published
  5. Jang, G. H., Chang, J. H., Hong, D. P. and K. S. Kim, 2002, 'Finite-element Analysis of an Electromechanical Field of a BLDC Motor Considering Speed Control and Mechanical Flexibility,' IEEE Transactions on Magnetics, Vol. 38, No. 2, pp. 945-948 https://doi.org/10.1109/20.996243
  6. Jang, G. H. and Kim, Y. J., 1999, 'Calculation of Dynamic Coefficients in a Hydrodynamic Bearing considering Five Degrees of Freedom for a General Rotor-bearing System,' ASME Journal of Tribology, Vol. 121, No. 3, pp. 499-505 https://doi.org/10.1115/1.2834095