Analysis of the Fluid Dynamic Bearings with Curve Surfaces in the Spindle Motor of a Computer Hard Disk Drive

컴퓨터 하드 디스크 드라이브 스핀들 모터에 사용되는 곡면 유체 동압 베어링 해석

This paper proposes a method to calculate the static characteristics of the FDBs with the curved surface. The general Reynolds equations are derived for the curved surfaces in the ${\theta}s$ plane. And the Reynolds equation is transformed to the finite element equations by considering the continuity of pressure and flow at the interface between the curved, journal and the thrust bearings. It also includes the Reynolds boundary condition in the numerical analysis to simulate the cavitation phenomenon. The static characteristics of the coupled journal and conical bearings were investigated due to the variation of conical angle. It shows that the conical angle is one of the important design parameters affecting the static and dynamic characteristics of FBBs.