Skip to main content
Log in

Robust shaft design to compensate deformation in the hub press-fitting and disk clamping process of 2.5″ HDDs

  • Technical Paper
  • Published:
Microsystem Technologies Aims and scope Submit manuscript

Abstract

We investigated deformation of the outer diameter of a shaft due to the hub press-fitting and disk clamping processes associated with a 2.5″ hard disk drive. We propose a new robust shaft design to minimize the effect of deformation on the outer diameter of the shaft. We numerically show the effect of deformation on the shaft due to the pressure, stiffness, and damping coefficients of fluid dynamic bearings (FDBs), and the critical mass and excitation response of the rotor-bearing system. We also experimentally measured the axial non-repeatable runout and the amplitude at the half speed whirl frequency of FDBs with both conventional and proposed designs. Through these tests we confirm that the proposed design improves the static and dynamic performance of the FDBs and rotor-bearing system.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Fig. 1
Fig. 2
Fig. 3
Fig. 4
Fig. 5
Fig. 6
Fig. 7
Fig. 8
Fig. 9
Fig. 10
Fig. 11
Fig. 12
Fig. 13

Similar content being viewed by others

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

    Article  Google Scholar 

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

    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 of five degrees of freedom of a general rotor-bearing system. Microsyst Technol 17:761–770

    Article  Google Scholar 

  • Koak KY, Jang GH, Kim HW (2009) 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 

  • 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, Jang GH, Jung KM (2013) 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 

  • Lee JH, Lee MH, Jang GH (2014) Effect of an hourglass-shaped sleeve on the performance of the fluid dynamic bearings of a HDD spindle motor. Microsyst Technol 20:1435–1445

    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 

Download references

Acknowledgments

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

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to Gunhee Jang.

Rights and permissions

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Kim, B., Lee, M. & Jang, G. Robust shaft design to compensate deformation in the hub press-fitting and disk clamping process of 2.5″ HDDs. Microsyst Technol 22, 1299–1305 (2016). https://doi.org/10.1007/s00542-016-2850-2

Download citation

  • Received:

  • Accepted:

  • Published:

  • Issue Date:

  • DOI: https://doi.org/10.1007/s00542-016-2850-2

Keywords

Navigation