Development of an axial-gap spindle motor for computer hard disk drives using PCB and dual air gap

The presence of particles, which can intrude into the air bearing, is one of the most common factors in the failure of hard disk drives (HDDs). Previous works investigated the particle trajectory inside air-filled drives without considering the temperature effects on the distribution of particles. Actually, for the submicron particle, particle trajectory and trapping status are affected by the temperature gradient since the thermophoretic force cannot be ignored. In this paper, considering the major heat generation components such as spindle motor and voice coil motor (VCM), the trajectories and trapping status for Al2O3 particles with diameter of 0.3 μm inside a 2.5 inch helium-filled drive are simulated by the commercial computational fluid dynamics solver FLUENT with user-defined functions (UDFs). The trapping criterion for Al2O3 particles are used as the boundary conditions for the different colliding surfaces.

Download Full-text

Experimental and parametric studies of 0.85-in. hard disk drives spindle motor vibration

Microsystem Technologies ◽

10.1007/s00542-008-0747-4 ◽

2009 ◽

Vol 16 (1-2) ◽

pp. 41-48

Author(s):

Tsung-Liang Wu ◽

I. Y. Shen ◽

F. Okamoto ◽

T. Asada

Keyword(s):

Hard Disk Drives ◽

Hard Disk ◽

Spindle Motor ◽

Disk Drives ◽

Parametric Studies ◽

Motor Vibration

Download Full-text

Air Bearing Spindle Motor for Hard Disk Drives

Tribology Transactions ◽

10.1080/05698190500313445 ◽

2005 ◽

Vol 48 (4) ◽

pp. 468-473 ◽

Cited By ~ 3

Author(s):

QIDE ZHANG ◽

GUOXIAO GUO ◽

CHAO BI

Keyword(s):

Hard Disk Drives ◽

Hard Disk ◽

Spindle Motor ◽

Air Bearing ◽

Disk Drives

Download Full-text

Optimum Design of Oil Lubricated Thrust Bearing for Hard Disk Drive with High Speed Spindle Motor

International Journal of Rotating Machinery ◽

10.1155/2013/896148 ◽

2013 ◽

Vol 2013 ◽

pp. 1-11 ◽

Cited By ~ 3

Author(s):

Yuta Sunami ◽

Mohd Danial Ibrahim ◽

Hiromu Hashimoto

Keyword(s):

High Speed ◽

Thrust Bearing ◽

Dynamic Stiffness ◽

Hard Disk Drives ◽

Hard Disk ◽

Disk Drive ◽

Optimization Method ◽

Spindle Motor ◽

Disk Drives ◽

Thrust Bearings

This paper presents the application of optimization method developed by Hashimoto to design oil lubricated thrust bearings for 2.5 inch form factor hard disk drives (HDD). The designing involves optimization of groove geometry and dimensions. Calculations are carried out to maximize the dynamic stiffness of the thrust bearing spindle motor. Static and dynamic characteristics of the modeled thrust bearing are calculated using the divergence formulation method. Results show that, by using the proposed optimization method, dynamic stiffness values can be well improved with the bearing geometries not being fixed to conventional grooves.

Download Full-text