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http://dx.doi.org/10.3795/KSME-A.2005.29.5.762

Analysis of a Bydrodynamic Bearing of a BDD Spindle Motor Due to Elevated Temperature  

Kim Kwan Soo (한양대학교 대학원 정밀기계공학과)
Kim Hak Woon (한양대학교 대학원 정밀기계공학과)
Lee Haeng Soo (삼성종합기술원, Storage Lab)
Kim Chul Soon (삼성종합기술원, Storage Lab)
Jang Gun Hee (한양대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.29, no.5, 2005 , pp. 762-769 More about this Journal
Abstract
This paper presents a method to investigate the characteristics of a hydrodynamic bearing of a HDD spindle motor due to elevated temperature considering the variation of the clearance as well as the lubricant viscosity. Iterative finite element analysis of the heat conduction and the thermal deformation is performed to determine the viscosity and clearance of a hydrodynamic bearing due to elevated temperature until the temperature of the bearing area converges. Proposed method is verified by comparing the calculated temperature with the measured one in elevated surrounding temperature as well as in room temperature. This research shows that elevated temperature changes the clearance as well as the lubricant viscosity of the hydrodynamic bearing of a HDD spindle motor. Once the viscosity and the clearance of a hydrodynamic bearing of a HDD spindle motor are determined, finite element analysis of the Reynolds equation is performed to investigate the static and dynamic characteristics of a hydrodynamic bearing of a HDB spindle motor due to elevated temperature. It also shows that the variation of clearance due to elevated temperature is another important design consideration to affect the static and dynamic characteristics of a hydrodynamic bearing of a HDD spindle motor
Keywords
Hydrodynamic Bearing; Clearance; Lubricant Viscosity; Heat Conduct; Thermal Deformation;
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  • Reference
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