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Sensor for magnetic disc driving advice based on rotary vibrating speed

一种磁盘驱动器、速度传感器的技术，应用在使用电/磁的方法的装置、对齐磁盘上的磁道、驱动/移动记录头等方向，能够解决没有产生传感器、磁道跟踪精度影响等问题，达到少成本、成本降低的效果

Inactive Publication Date: 2004-04-07
HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sensor size, bandwidth, and cost are considered limitations of microelectromechanical sensors (MEMS)
[0023] As such, conventional sensors do not have the ability to properly handle random vibration issues, which can have a significant impact on the track-following accuracy of HDD actuator systems, and have not yielded cost-effective sensors for sensing rotational vibration (RV) velocity or acceleration

Method used

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  • Sensor for magnetic disc driving advice based on rotary vibrating speed
  • Sensor for magnetic disc driving advice based on rotary vibrating speed
  • Sensor for magnetic disc driving advice based on rotary vibrating speed

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Embodiment Construction

[0061] Please refer now to the attached drawings, specifically to the Figure 3(a)-27(b) , which show preferred embodiments of methods and structures according to the invention.

[0062] preferred embodiment

[0063] please see Figure 3(a) and 3(b) , the actuators of disk drive 300 generate reactive torque during seeks. In computer configurations with multiple actuators arranged in an array, the multiple reaction forces generated by the actuators create a spectrum of vibrations.

[0064] The form and magnitude of the vibrational (e.g., linear and rotational) spectrum is system-specific, but it tends to be a band-limited power spectrum, alternating with a finite number of harmonics. Substrate vibrations, especially along the X, Y, and Z vicinity (eg, coordinates θ) may generate TMR.

[0065] As mentioned above, the main influence on TMR comes from theta dynamics. Transmission mass imbalance contributes to TMR through torque disturbances produced by linear vibrations of t...

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Abstract

A disk drive (HDD) subject to linear and rotational vibration, includes an independent sensing unit for sensing a rotational velocity component of the HDD rotational vibration in a predetermined frequency range.

Description

[0001] Cross References to Related Applications [0002] This application is related to U.S. Patent Application No. 10 / 153,687, entitled "METHOD AND SYSTEM FORROTATIONAL VELOCITY-BASED ALGORITHM FORVIBRATION COMPENSATION IN DISK DRIVES" by Sri M. Sri-Jayantha et al. Method and System for Computing Vibration Compensation in Disk Drives) is assigned to the present assignee with IBM Docket No. YOR920010081 US 1, which application is incorporated herein by reference. technical field [0003] Generally, the present invention relates to a magnetic disk drive, and more particularly, to a magnetic disk drive that minimizes theta-dynamically generated track misalignment (TMR) by a rotational vibration-based velocity sensor. Background technique [0004] The sustained data rate of a hard disk drive (HDD) is often reduced in the presence of rotational vibration in a computer rack system. Rotational vibration (RV) can be generated by random seek activity in a set of HDDs, and consumers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P3/46G11B5/596G11B21/10H02P25/06
CPCG11B5/596
Inventor 斯瑞·M·斯瑞-嘉延塔邓宪维贾叶斯沃·达斯·卡纳杰拉德·迈克维可睦郎太田
Owner HITACHI GLOBAL STORAGE TECH NETHERLANDS BV
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