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Effect of an hourglass-shaped sleeve on the performance of the fluid dynamic bearings of a HDD spindle motor

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Abstract

This research investigated the characteristics of fluid dynamic bearings (FDBs) in a HDD spindle motor with an hourglass-shaped sleeve. We demonstrated experimentally that the hourglass-shaped sleeve generated through the ball-sizing process is a major source of large repeatable runout and non-repeatable runout in a HDD spindle system. We also numerically proved the effect of hourglass-shaped sleeves on pressure, friction torque, stiffness and damping coefficients, critical mass, and shock response. Finally, we proposed a robust design for FDBs with hourglass-shaped groove depths to compensate for the decrease in the static and dynamic performance of FDBs with hourglass-shaped sleeves. The proposed hourglass-shaped groove depth improves the performance of FDBs with both straight and hourglass-shaped sleeves.

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References

  • Jang GH, Lee SH (2006) Determination of the dynamic coefficients of the coupled journal and thrust bearings by the perturbation method. Tribol Lett 22:239–246

    Article  Google Scholar 

  • Jang GH, Yoon JW (2003) Stability analysis of a hydrodynamic journal bearing with rotating herringbone grooves. J Tribol 125:291–300

    Article  Google Scholar 

  • Jang GH, Lee SH, Kim HW (2006) Finite element analysis of the coupled journal and thrust bearing in a computer hard disk drive. J Tribol 128:335–340

    Article  Google Scholar 

  • Kim MG, Jang GH, Kim HW (2010) Stability analysis of a disk-spindle system supported by coupled journal and thrust bearings considering five degrees of freedom. Tribol Int 43:1479–1490

    Article  Google Scholar 

  • Kim MG, Jang GH, Lee JH (2011) Robust design of a HDD spindle system supported by fluid dynamic bearings utilizing the stability analysis. Microsyst Technol 17:761–770

    Article  Google Scholar 

  • Koak KY, Jang GH, Kim HW (2009a) Whirling, tilting and axial motions of a HDD spindle system due to the manufacturing errors of FDBs. Microsyst Technol 15:1701–1709

    Article  Google Scholar 

  • Koak KY, Kim HW, Jung KM, Jang GH (2009b) Dynamic characteristics of a HDD spindle system due to imperfect shaft roundness. IEEE Trans Magn 45:5148–5151

    Article  Google Scholar 

  • Lee JH, Jang GH, Ha HJ (2012) Robust optimal design of the FDBs in a HDD to reduce NRRO and RRO. Microsyst Technol 18:1335–1342

    Article  Google Scholar 

  • Lee JH, Lee MH, Jang GH (2013a) Experimental verification of the optimal FDBs in a HDD spindle motor to minimize power loss. IEEE Trans Magn 49:2437–2440

    Article  Google Scholar 

  • Lee JH, Jang GH, Jung KM (2013b) Optimal design of fluid dynamic bearings to develop a robust disk-spindle system in a hard disk drive utilizing modal analysis. Microsyst Technol 19:1495–1504

    Article  Google Scholar 

  • Yoon JK, Shen IY (2005) A numerical study on rotating-shaft spindles with nonlinear fluid-dynamic bearings. IEEE Trans Magn 41:756–762

    Article  Google Scholar 

  • Zhang XQ, Wang XL, Liu R (2012) Effects of microfabrication defects on the performance of gas bearings with high aspect ratio in microengine. Tribol Int 48:207–215

    Article  MathSciNet  Google Scholar 

Download references

Acknowledgments

This research was performed at the Samsung-Hanyang Research Center for Precision Motors, sponsored by Samsung Electro-Mechanics Co. Ltd. and by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0021919).

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Authors and Affiliations

  1. PREM, Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea

    Jihoon Lee, Minho Lee & Gunhee Jang

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  1. Jihoon Lee
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  2. Minho Lee
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  3. Gunhee Jang
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Correspondence to Gunhee Jang.

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Lee, J., Lee, M. & Jang, G. Effect of an hourglass-shaped sleeve on the performance of the fluid dynamic bearings of a HDD spindle motor. Microsyst Technol 20, 1435–1445 (2014). https://doi.org/10.1007/s00542-014-2136-5

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  • DOI: https://doi.org/10.1007/s00542-014-2136-5

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