J. P. Yang

A silicon microactuator using integrated microfabrication technology

In this paper, a silicon electrostatic microactuator is developed using the proposed MEMS technologies with integrated head element fabrication processing in disk drive industry.

Shock analysis of MEMS actuator integrated with HGA for operational and non-operational HDD

In this paper, the effects of shock on MEMS microactuator integrated with Head Gimbal Assembly (HGA) for operational and non-operational HDD are studied. ANSYS/LS-DYNA is used for the finite element modeling and simulation. Shock responses are investigated at the height with the shock amplitude of 1000g and within the shock duration of 1ms. The preloaded state of the suspension is considered for the simulations. The operational HDD model uses linear springs to represent the air bearing stiffness of the head disk interface. The maximum stress is located at the corner of the flexure beam and center portion. A larger maximum stress is found for the nonoperational HDD model compared to the operational HDD model. This is due to the strong air bearing forces limiting slider motion.

Three dimensional finite element model for transient temperature prediction in hard disk drive

Hard disk drive (HDD) is often subjected to transient temperature during frequent seeking or due to the change of environmental conditions that causes HDD reliability problems. This paper presents a three dimensional (3D) finite element modelling technique that can be used to predict the transient temperatures of the HDD when it subjected to transient temperature during frequent seeking or due to the change of environmental conditions.

Enhancement of hard disk drive heat dissipations with integrated cooling devices

Thermal management has become a significant issue to be considered whilst designing high performance and high reliable hard disk drives (HDD). This paper proposes a compact ultra-thin cooling device for enhancing heat dissipation of HDD. The miniature device was designed and prototyped to its optimal cooling efficiency according to the thermal characteristics of operating HDD. The experimental results of this newly developed device show that it can offer up to 35% enhancement of heat dissipation with a lower power consumption of 10 mW. Furthermore, the low power consumption device has been fully integrated with the disk drive without modifying the structure of the disk drive. This device provides a key for the design engineers in developing reliable and longer operational life hard disk drives.Copyright

Comparative study of electrostatic analysis for disk drive microactuator

Investigation of the driving capability of a microactuator used in hard disk drives (HDD) is essential to ensure that the head is moved to the desired track under a certain voltage. This paper presents three different approaches to calculate the driving torque in a rotary electrostatic microactuator, namely analytical methods, the finite element method (FEM) and the boundary element method (BEM). The torque is roughly calculated using the simplified analytical model first, and then the results are compared with those obtained from FEM and BEM software. This study shows that the simplified analytical model is feasible in the preliminary design stage.