3.5인치 HDD용 FDB스핀들 시스템의 훨링, 플라잉과 틸팅 거동에 관한 연구

다국어 초록 (Multilingual Abstract)

This research develops an experimental method to measure the motion of a FDB spindle system with a 3.5' disk by using three capacitance probes fixed on the xyz-micrometers, and it shows that a FDB spindle system has the whirling, flying and tilting motion. It also shows that the whirling, flying and tilting motion converge very quickly to the steady state at the same time when the rotor reaches the steady-state speed. However, they are quite large even at the steady state when they are compared with the 10nm flying height of a magnetic head. For the FDB spindle system used in this experiment, the whirl radius and the peak-to-peak variation of flying height and tilting angle at the steady-state speed of 7,200rpm are 0.675m, 30nm and $5.758\times10^{-3^{\circ}}$, respectively, so that the radial motion of the FDB spindle system exceeds a track pitch of a 3.5' HDD with 90,000 TPI.

참고문헌 (Reference)

1 "Nonlinear Dynamic Analysis of a Hydrodynamic Journal Bearing Considering the Effect of a Rotating or Stationary Herringbone Groove" 124 : 297-304, 2002

2 "Fundamentals of Fluid Film Lubrication. McGraw-Hill Inc." 1994

3 "Dynamic Characteristics of a Coupled Journal and Thrust Hydrodynamic Bearing in a HDD Spindle System due to its Groove Location" 261-, 2002

4 "Calculation of Dynamic Coefficients in a Hydrodynamic Bearing Considering Five Degrees of Freedom for a General Rotor-bearing System" 121 : 499-505, 1999

5 "An Investigation of Nonrepeatable Spindle Run-out" magn : -23, pp.3687~3689.