Abstract
The purpose of this paper is to optimize OP-vibration performance of 3.5-in. hard disk drive (HDD) spindle motors through theoretical prediction and experimental verification. OP-vibration performance of HDD is closely related to the first rocking vibration of spindle motors because excited frequencies of 3.5-in. HDD from the environment are mostly below 500 Hz and the first rocking vibration is the only resonance in the corresponding frequencies. Therefore, minimizing first rocking vibration leads to improve OP-vibration performance of the spindle motors. In order to minimize the first rocking vibration key parameters of FDB spindle motors were selected from a previous work done by Heo and Shen (Microsyst Technol 11:1204–1213, 2005). Then, the selected parameters have been optimized to minimize the first rocking vibration through a theoretical model developed at University of Washington. Then, experiments with ten prototype FDB spindle motors have been conducted to verify the theoretical results. Each prototype motor has different spindle parameter configurations including bearing coefficients, bearing locations, and center of gravity location, etc. Also, this paper demonstrated that radial measurements of spindle rocking vibration have better correlation with OP-vibration performance than axial measurements through PES measurements. Finally, the optimized design has been manufactured by a motor maker and has also successfully verified the theoretical prediction experimentally.
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References
Heo B, Shen IY (2005) A parametric study on rocking vibration of hard disk drive spindle motors with fluid-dynamic bearings and rotating-shaft design. Microsyst Technol 11:1204–1213
Tseng CW (2002) Vibration of rotating-shaft design spindles with flexible bases. PhD Dissertation, University of Washington
Tseng CW, Shen JY, Shen IY (2003) Vibration of rotating-shaft HDD spindle motors with flexible stationary parts. IEEE Trans Magnetics 39(2):794–799
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Heo, B., Lee, H.S. & Kim, W. Optimization of 3.5-in. HDD spindle motors for OP-vibration performance: theoretical prediction and experimental verification. Microsyst Technol 13, 759–766 (2007). https://doi.org/10.1007/s00542-006-0270-4
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DOI: https://doi.org/10.1007/s00542-006-0270-4