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Robust hub design to prevent mechanical contact between the hub and sleeve of FDBs in an HDD due to disc clamping force

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Abstract

We investigated the rotational harmonic source of the runout in a 2.5″ hard disk drive (HDD) with a height of 5 mm, especially at low rotating speeds. After disassembling the HDD, circumferential scratches between the upper thrust surface of the hub and sleeve were observed. Through a finite element static analysis of the hub, the deflection resulting from disc clamping force was identified as a source of mechanical contact between the rotating hub and the stationary sleeve. This was determined to generate large-amplitude harmonics in the runout and flying height lower than design values. To prevent mechanical contact between these components, we propose a robust hub design in which the hub thickness radially decreases between the inner and outer thrusts. And HDD spindle motor was prototyped with the proposed hub. Experiments showed that the flying height is increased almost same as design value and the harmonics of the runout were significantly reduced, even at low rotating speeds. After disassembling the prototyped HDD spindle motor, we confirmed that there were no scratches on the surface of the thrust bearing.

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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(3):239–246

    Article  MathSciNet  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. ASME J Tribol 128:335–340

    Article  Google Scholar 

  • Kawamoto H (2001) Contact characteristics of a laser scanner motor in a laser printer in the low speed region. J Imaging Sci Tech 45:489–494

    Google Scholar 

  • Kim MG, Jang GH, Lee CJ (2010) Experimental identification of abnormal noise and vibration in a high-speed polygon mirror scanner motor due to mechanical contact of plain journal bearing. Microsyst Technol 16:3–8

    Article  Google Scholar 

  • Lee YZ, Jeong SH, Jeong KS (2000) Frictional and electrical characteristics of grooved fluid film bearing for high-speed laser scanner motor. ASME J Tribol 122:557–564

    Article  Google Scholar 

Download references

Acknowledgments

This research was performed at Samsung-Hanyang Research Center for Precision Motors, sponsored by Samsung Electro-Mechanics Co. Ltd.

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Authors and Affiliations

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

    Bumcho Kim & Gunhee Jang

  2. Samsung Electro-Mechanics Co., Maetan 3-dong, Yeongtong-gu, Suwon-si, Gyeonggi-do, 443-743, Republic of Korea

    Bumcho Kim

Authors
  1. Bumcho Kim
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  2. Gunhee Jang
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Correspondence to Gunhee Jang.

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Kim, B., Jang, G. Robust hub design to prevent mechanical contact between the hub and sleeve of FDBs in an HDD due to disc clamping force. Microsyst Technol 21, 2797–2802 (2015). https://doi.org/10.1007/s00542-015-2571-y

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  • DOI: https://doi.org/10.1007/s00542-015-2571-y

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