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Journal of Mechanics Engineering and Automation 2014年第7期4卷 547-554页

作者： Masayuki Ochiai Yuta Sunami Hiromu Hashimoto Department of Mechanical Engineering Tokai University Kanagawa 259-1292 Japan

This paper describes the experimental study on shock response of FDB （fluid dynamic bearing） spindle for HDDs （hard disk drives）. The FDBs are widely used as rotating shaft support elements for HDD spindle motors. Recently, the opportunity for the HDD spindle motors exposed to external vibration has been increasing because the HDDs are used for various information related equipment such as mobile PCs （personal computers）, video cameras, car navigation systems and so on. Hence, the rotating shaft has a possibility to come in contact with the bearing by external shocks and it causes wear or seizure to the bearing surface. To avoid the problem, it is extremely important to know how the spindle moves against the large shock on HDDs experimentally. However, as far as the authors know, there are few experimental studies treating the shock response of HDD spindles. In this paper, firstly, we propose a new test rig and experimental method for shock response of FDB spindles. Then the shock tests against the radial and axial disturbance on FDB spindle for 2.5＂ HDD are conducted. Finally, the experimental results of shock response waveforms and maximum displacement of disk are shown.

关键词： Tribology fluid film bearing hard disk drive spindle motor shock test shock response

Characteristic Analysis of Ultrathin Film Gas Lubrication Based on Modified Reynolds Equation in hard disk drive

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Characteristic Analysis of Ultrathin Film Gas Lubrication Ba...

Application of Miniature PMSM in hard disk drive

2009中国控制与决策会议

作者： Niu Rongjun~1,Liu Hongbin~1,Huang Ping~2 1.Electromechanical Engineering College,Henan University of Science and Technology,Luoyang 471003,China 2.Mechanical Engineering College,South China University of Technology,Guangzhou 510640,China

＜正＞In this paper,the authors firstly devote to develop an improved model based on FK-Boltzmann model suitable to arbitrary Knudsen ***,an effective numerical method is proposed to calculate the modified Reynolds equation for ultra-thin gas film *** analysis based on the modified Reynolds equations is performed on a typical negative pressure magnetic head *** numerical results show that the modified model and numerical method are valid for slider air bearing with nanometer spacing. Major performance parameters such as the gas film pressure and load carrying capacity,are gained by numerical calculation.

关键词： MEMS Gas Lubrication hard disk drive

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Application of Miniature PMSM in Hard Disk Drive

DYNAMIC CHARACTERISTICS OF BEARINGS AND PIVOTS OF hard disk driveS

第十三届中国小电机技术研讨会

作者： Chao BI (A*STAR,Data Storage Institute,Singapore 117608 Exploit Technologies Pte Ltd.,Singapore)

hard disk drive is now the product using the most of permanent magnet synchronous motor (PMSM).The trend of hard disk drive is to high data capacity and be used in consumer *** performance of the motor used in the drive is thus critical to the progress of hard disk drive *** paper introduces several key technologies related with the high performance miniature *** the applications of these PMSMs in hard disk drive,the motor structure and components has to be special designed,and many special issues have to be considered

关键词： miniature PMSM hard disk drive

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DYNAMIC CHARACTERISTICS OF BEARINGS AND PIVOTS OF HARD DISK ...

Investigation of HDD Ramp Unloading Processes with an Efficient Scheme

第五届国际振动工程会议

作者： N.Guo L.M.Xu R.M.Lin H.Du C.D.Deng School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 School of Mechanical and Production Engineering Nanyang Technological University Singapore 639798 Nidec Singapore Pte Ltd 36 Loyang WaySingapore

＜正＞ It is known that the quasi-rigid bodymode（QR mode）vibration is one of the mainsources for generating the residual vibration insettling operation and limiting the servo bandwidth,and is mainly caused by the stiffness of the pivot,themass and structure of the head actuator *** ballbearings inside the pivot determine the pivotstiffness,which in turn,determine the effectivestiffness of the head actuator *** this paper,the stiffness-related issues among ball bearings,pivot and head actuator assembly are studiedtheoretically and *** shows that thepivot effective radial stiffness depends not only onthe stiffness of the ball bearing but also on theconnection method used to attach the pivot to thehead actuator *** is also shown from themeasurement and analysis that the resonancefrequency of the QR mode,determined by the pivoteffective radial stiffness and inherent properties ofthe head actuator arm,can be moved to a higherfrequency by using a more rigid pivot and a morestiff joint.

关键词： ball bearing pivot stiffness natural frequency hard disk drive

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Advances in Applied Mathematics and Mechanics 2011年第6期3卷 716-728页

作者： Yan Liu Hejun Du School of Mechanical and Aerospace Engineering Nanyang Technological University50 Nanyang AvenueSingapore 639798Singapore

Ramp load/unload(L/UL)mechanisms are widely used to rest sliders in hard disk drives(HDDs).Loading/unloading a slider swiftly and smoothly is crucial in a HDD design.A novel,efficient simulation scheme is proposed to investigate the behaviors of a head disk interface(HDI)in ramp unloading processes.A dual scale model is enabled by decoupling the nano-meter scale change of an air bearing and the micro-or milli-meter scale deformation of a suspension.A modified Reynolds equation governing the air bearing was solved *** slider design was characterized with performance *** stages in an unloading process were analyzed with a lumped parameter suspension *** parameters for the model were estimated with a comprehensive finite element suspension ***,simulation results are presented for a commercial HDI design.

关键词： hard disk drive ramp unloading head-disk interface suspension Reynolds equation performance surfaces

Beam design for voice coil motors used for energy harvesting purpose with low frequency vibrations:A finite element analysis

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International Journal of Modeling, Simulation, and Scientific Computing 2016年第3期7卷 1-17页

作者： Hector A.Tinoco Department of Mechanics and Production Universidad Autonoma de Manizales(UAM)Grupo de Diseno Mecanico y Desarrollo Industrial Antigua Estaci´on del Ferrocarril Edificio Sacatin C.P.170001 Manizales-Caldas Colombia

In this study,a numerical approach is established to design a beam coupled to a Voice Coil Motor(VCM)with the aim to maximize the displacement in the inductive transducer.A finite element model is developed to simulate a VCM with different beams applying a harmonic *** VCM is extracted from a recycled hard disk drive(HDD)and a parametric modal analysis is performed to identify the material parameters of the HDD and the *** parameters are obtained comparing the real vibration modes and natural frequencies(VCM-beam)with those determined from the finite element model.A numerical-experimental case study is carried out to demonstrate that if a beam is designed for a specific low frequency vibration between 0 and 10 Hz,the displacements are maximized in the *** this purpose,real acceleration measurements taken from three individuals are used to provide the vibration signals in the numerical model.A beam is designed for one of the individuals using the natural frequency values determined from the measured *** show that the displacements are maximized in the model which coincides with the natural frequency of the chosen *** main purpose of this research is to establish a design tool for energy harvesting purposes with VCM based on low frequency vibration sources as for example gait motions.

关键词： hard disk drive HDD energy harvesting finite element analysis Wiimote voice coil motor VCM modal analysis

Design of Intersample Response in a hard disk Control System

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Journal of Mechanics Engineering and Automation 2012年第7期2卷 405-410页

作者： Takao Sato Yoshiki Hattori Nozomu Araki Yasuo Konishi Graduate School of Engineering University of Hyogo Himeji 671-2201 Japan

The present paper discusses a design method for the head position in a hard disk drive （HDD） control system. In the HDD control system, the sampling interval of the head position is constrained because of the hardware specifications, but the hold interval of the control input is not constrained. In the present study, a multirate control system is designed, in which the sampling and the hold intervals are not equal. A multirate control law, which stabilizes a closed-loop system, is extended using newly introduced parameters such that the sample response of the plant output is maintained. Furthermore, intersample ripples in the steady state are eliminated using the new design parameters, which can be selected independently of the sample response. As a result, the intersample response can be improved independently of the sample response. The proposed method is applied to a benchmark problem of an HDD system, and its effectiveness is demonstrated.

关键词： Multirate control system single-rate control system hard disk drive state-space representation intersample response sample response pole assignment.

Identification Method of Dynamic Coefficients of Fluid Film Bearings for HDD Spindle Motors

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Journal of Mechanics Engineering and Automation 2014年第2期4卷 123-129页

作者： Masayuki Ochiai Yuta Sunami Hiromu Hashimoto Department of Mechanical Engineering Tokai University Hiratsuka 259-1292 Japan

Fluid film bearings are widely used as support elements of rotating shaft for HDD （hard disk drive） spindle motors. Recently, the opportunity for the HDD spindle motors exposed to external vibration has been increasing because the HDDs are used for various information related equipments such as mobile PCs, car navigation systems. Hence, the rotating shaft has a possibility to come in contact with the bearing and it causes wear or seizure to the bearing surface. In order to avoid the problems, it is extremely important to enhance the dynamic characteristics of the fluid film bearings for spindles. However, verification from both theory and experiment of dynamic characteristics such as spring coefficients and damping coefficients is rare and few. In this paper, the bearing vibration characteristics when the HDD spindle is oscillated are investigated theoretically and experimentally. And then the identification method ofoil film coefficients of fluid film bearing spindles is described.

关键词： Tribology fluid film bearing hard disk drive spindle motor dynamic coefficient vibration identification.