Mc-22 Development of a Head Actuator Based on the New Design Concept for the Wide Servo Bandwidth in a Hard Disk Drives

Arisaka, Toshihiro; Shimizu, Toshihiko; Masuda, Hiromitsu; Atsumi, Takenori; Nakamura, Gentaro

doi:10.1299/jsmemipe.2003.187

Cited by 9 publications

(4 citation statements)

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“…As a result, the residue of the primary resonance becomes significant. In order to decrease the residue of the primary resonance, we developed a mechanical structure using a four-bar linkage mechanism (Arisaka et al, 2003). The proposed design concept is based on the fact that a small head displacement reduces the residue of modes.…”

Section: Designing a Mechanical Systemmentioning

confidence: 99%

Integrated Design of a Controller and a Structure for Head-positioning in Hard Disk Drives

Atsumi¹,

Shimizu²,

Arisaka³

et al. 2006

Journal of Vibration and Control

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In head-positioning systems of hard disk drives, the negative effects of a primary resonant mode are serious problems for positioning accuracy. In order to improve positioning accuracy, the primary resonant frequency should be increased because the effects of the primary resonant mode limit the servo bandwidth. An integrated design of a controller and structure for the head positioning system was developed to solve this problem. We showed that the servo bandwidth is limited not only by the peak frequency of the primary resonance but are also its residue. The proposed method decreases the negative impact of the primary resonant mode through a newly designed modal shape, and increases the servo bandwidth without the addition of any sensors or actuators. The effectiveness of this method was verified by designing an actual servo control system and experimentally measuring its bandwidth, demonstrating that the method increases the servo bandwidth without increasing the production cost.

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Section: Designing a Mechanical Systemmentioning

confidence: 99%

Integrated Design of a Controller and a Structure for Head-positioning in Hard Disk Drives

Atsumi¹,

Shimizu²,

Arisaka³

et al. 2006

Journal of Vibration and Control

Self Cite

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“…To amplify displacement, the PZT actuator coupled with the VCM mechanism has attracted researchers over years. In order to decrease the residue of the primary resonance caused by the head positioning system, ARISAKA et al [12] developed a mechanical structure using a four-bar linkage mechanism. Liu and Wang [13] presented the control performance of a combined piezo-VCM actuator where onedegree-of-freedom experimental setup was configured, and the control performance was effectively demonstrated by using a switching controller.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of hard disk drive manipulator using piezoelectric actuator mechanisms

Khasawneh

Jaradat

Naji

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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This paper discusses the employment of piezoelectric actuators (PEA) to encompass high precision-scale movement capability of magnetic hard disk drive servo systems. To overcome path/positioning limitations of previous hard disk servo systems, a new design consisting of three PEAs links is proposed. Two different controllers, namely PI and fuzzy, are designed and simulated to assess the performance of the proposed design over a couple of paths under the presence of noise and disturbance. Simulation results show that the proposed design is able to track complex paths over a wider spectrum of motion than conventional hard drive servo systems. This improves the read-write process by affording nanoscale motion and provides high levels of positioning accuracy, as well as wide spectrum of positioning capability. Moreover, both controllers reveal the ability to drive the mechanism with quick response and minimal overshoot, with the fuzzy controller outperforming the PI controller under the presence of noise and disturbance.

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“…Jang and Park presented a numerical method to analyze the electromechanical variables of a spinning disk-spindle system, and they showed a possibility to detect the free-falling HDD by monitoring the electromechanical signals of a spindle motor (Jang and Park 2005). Also, many researchers have presented the dynamic characteristics and proposed designs for an actuator assembly, or actuator servo control algorithms to compensate for the vibration and various disturbances during the head positioning process of a HDD (Wang et al 2000;Onuki and Ishioka 2001;Arisaka et al 2003;Xu and Guo 2003). However, most of the work has investigated the disk-spindle system or actuator separately in electromagnetic or mechanical fields or both fields, and they did not investigate the electromechanical variables of an actuator due to the change in the electromechanical variables of the rotating disk-spindle of an operating HDD.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the electromechanical variables of the spindle motor and the actuator of a HDD due to positioning and free fall

Jang

Park

Kim³

et al. 2006

Microsyst Technol

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This research investigates the electromechanical variables of a spindle motor and an actuator of an operating hard disk drive (HDD) due to the positioning and the free-fall of a HDD. Magnetic fields of a brushless DC motor and a voice coil motor are determined by the time-stepping finite element equation of the Maxwell equation and the driving circuit equation. The pressure of the fluid dynamic bearings (FDBs) is determined by solving the finite element equation of the Reynolds equation to calculate the reaction force and the friction torque. Dynamic equations of the rotating disk-spindle, actuator, and stationary bodies of a HDD are derived from the Newton-Euler's equation. The speed control of the rotating disk-spindle and the servo control of the actuator are included to describe the head positioning between the rotating disk and the head. The simulation is performed to investigate the electromechanical variables of the spindle motor and the actuator due to the positioning and the free-fall of a HDD. This research shows that the positioning and the free-fall of a HDD change the electromechanical variables of the spindle motor and the actuator of an operating HDD, and that monitoring their electromechanical variables may identify the positioning and the free-fall of a HDD without using extra sensors.

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Mc-22 Development of a Head Actuator Based on the New Design Concept for the Wide Servo Bandwidth in a Hard Disk Drives

Cited by 9 publications

References 0 publications

Integrated Design of a Controller and a Structure for Head-positioning in Hard Disk Drives

Integrated Design of a Controller and a Structure for Head-positioning in Hard Disk Drives

Enhancement of hard disk drive manipulator using piezoelectric actuator mechanisms

Investigation of the electromechanical variables of the spindle motor and the actuator of a HDD due to positioning and free fall

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