Design of a Collocated Dual Stage Suspension in a Hard Disk Drive

2014 ◽  
Author(s):  
Longqiu Li ◽  
Karcher Morris ◽  
John Hogan ◽  
Frank E. Talke
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Element Analysis ◽  
Lateral Deflection ◽  
Dual Stage ◽  
Dual Stage Actuator

The design of a collocated head-based dual stage actuator is investigated using finite element analysis. The effect of gimbal design dimensions on the lateral deflection is evaluated. Comparison of the present dual stage head-based actuator is made with other suspension-based designs and the collocated design proposed by Lengert et al [1].

Tolerance Ring Design in the Actuator Arm of a Hard Disk Drive Using Finite Element Analysis

2013 ◽  
Vol 275-277 ◽  
pp. 716-730 ◽  
Author(s):  
Somkid Suthaweesub ◽  
Arbtip Dheeravongkit
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hard Disk Drive ◽  
Contact Surface ◽  
Hard Disk ◽  
Disk Drive ◽  
Total Deformation ◽  
Element Analysis ◽  
Rocking Motion ◽  
The Waves

This paper presents conceptual designs for the tolerance ring in the Hard Disk Drive (HDD) in order to reduce the total deformation of the tolerance ring and decrease the installation force during the assembly process of the actuator arm, while maintaining the natural frequency within the specification range. In this research, finite element analysis was employed to compare and analyze the installation forces, total deformations of the tolerance ring and the natural frequencies of Actuator Pivot Flex Assembly (APFA). Around its cylindrical body, the tolerance ring consists of several waves which provide rigidity for the APFA assembly to resist the axial rocking motion of the actuator arm. The idea is to decrease the contact surface area between the waves and the e-block by smoothing the contact surface of the waves along the installation direction while maintaining sufficient friction to resist the axial rocking motion. The objective of this research was to minimize the total deformation and installation force. The three input variables, i.e. width, length and height of the alternating flat curve design, were analyzed together by using the engineering optimization. The decreasing of the total deformation of the tolerance ring and installation force during APFA assembly would increase the number of cycles of the reworking process which can help increase the productivity and efficiency of HDD manufacturing.

Finite Element Analysis of the Coupled Journal and Thrust Bearing in a Computer Hard Disk Drive

2005 ◽  
Vol 128 (2) ◽  
pp. 335-340 ◽  
Author(s):  
G. H. Jang ◽  
S. H. Lee ◽  
H. W. Kim
Keyword(s):  
Finite Element ◽  
Hard Disk Drive ◽  
Thrust Bearing ◽  
Fluid Dynamic ◽  
Hard Disk ◽  
Disk Drive ◽  
Flying Height ◽  
Separate Analysis ◽  
Element Analysis ◽  
Thrust Bearings

This paper proposes a method to calculate the characteristics of a coupled fluid dynamic journal and thrust bearing of a hard disk drive (HDD) spindle motor. The governing equations for the journal and thrust bearings are the two-dimensional Reynolds equations in the θz and rθ planes, respectively. The finite element method is appropriately applied to analyze the coupled bearing under the conditions of the continuity of mass and pressure at the interface between the journal and thrust bearings. The pressure in the coupled bearing was calculated by applying the Reynolds boundary condition. The validity of this application was verified by comparing the analytical results of the flying height at various rotating speeds with experimental results. The characteristics of the coupled journal and thrust bearing were also investigated due to the Reynolds and Half-Sommerfeld boundary conditions and the coupled and separate analysis. This research demonstrates that the proposed method can accurately and realistically describe the coupled fluid dynamic bearing in a HDD system.

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