Improved performance of hard disk drive servomechanism using digital multirate control

... diagram of the hard disk drives [9] A brief description of each of the components of the disk servo loop is presented in the following section [10] Fig.2.3 Block diagram of hard disk drive • Disks ... Historic improvement in hard disk storage cost…………………………23 2.2 Disk drive data rate …………………………………………………… 24 2.3 Block diagram of hard disk drive ………………………………...

Ngày tải lên: 17/09/2015, 17:20

... Chapter Introduction The modern information technology consists of three parts: information acquiring, information processing, information transferring and information storage In fact, information ... Exploration of In- Situ Diagnosis Methods for the Evaluation of Mechanical and Magnetic Performance of Hard Disk Drives ZHU JIN （B.Eng (hons) HUST, P....

Ngày tải lên: 05/10/2015, 22:15

... The disk is mounted through a hole at the center on the spindle of a motor for spinning of the disks The data are recorded on a continuously spinning disks which are made of aluminum or glass and ... used in high performance hard disk drives in which the spindle speed is around 10,000 RPM or more Many models of hard disk drives for the desktop and mobile environmen...

Ngày tải lên: 16/10/2015, 15:38

... Equivalent circuits of series compensated induction motor for system frequency and self-excited frequency Oscillating current waveforms because of self-excitation of induction motor by MERS with open ... SELF-EXCITATION OF SERIES COMPENSATED INDUCTION MOTOR It is well known that series compensation of induction motor may cause some unstable situations[6] Since MER...

Ngày tải lên: 15/10/2013, 16:10

... ROBUST DESIGN OF MINIATURISED SPINDLE MOTORS FOR HARD DISK DRIVE GAO XIAN KE (M.Eng, B.Eng) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF ELECTRICAL AND ... application of robust design in hard disk drive industry As the objective of the research is to formulate effective robust design approaches systematically for the...

Ngày tải lên: 17/09/2015, 17:20

... General Command Set GUI Graphical User Interface GMR Giant Magneto Resistance GPIB General Purpose Interface Bus HDD Hard Disk Drive HDI Head Disk Interface HGA Head Gimbal Assembly HSA Head Stack ... as virtual mirror of the recording head and to close the flux loop from the head 1.2.2 Read and Write head The read sensor, the writer coil, together with th...

Ngày tải lên: 26/11/2015, 12:14

... ổ cứng tổ chức mà số tài liệu nói chung chung “tổ chức liệu ổ cứng Tổ chức liệu đĩa cứng cách xếp phần tử/đơn vị lưu trữ liệu mức thấp mà nhà sản xuất quy định đồng thời giá trị đo lường ổ cứng ... cần nguồn nuôi” B.Tổ chức liệu đĩa cứng : Ở xin khẳng định rõ quan điểm “tổ chức liệu (hay gọi tổ chức liệu cấp thấp)” đĩa cứng để phân biệt rõ ràng với “tổ chức...

Ngày tải lên: 13/12/2013, 04:15

... the first hard disk with 1.8 platters, later used for PC-card disk drives F IRST 1.3 FORM FACTOR DISK DRIVE (1992): Hewlett Packard’s C3013A is the first 1.3 drive F IRST HIGH GB DISK DRIVE (1993): ... Engineering Drive Singapore 117608 British Library Cataloguing in Publication Data Hard disk drive servo systems - 2nd ed - (Advances in industrial control) 1.Servomecha...

Ngày tải lên: 14/12/2013, 19:15

... section will be utilized heavily in later chapters to solve track-following problems in hard disk drive servo systems 3.6.1 Continuous-time Systems Consider the following continuous-time system: ... the imaginary axis We believe that such a condition is always satisfied for most HDD servo systems However, most servo systems can be represented as certain chains of integrators and th...

Ngày tải lên: 14/12/2013, 19:15

... switching Moreover, the RPT controllers in a track-following servo have been proved to be robust against resonance mode changes from disk to disk and work well against runout disturbances The MSC law ... the plant to be controlled even for a small error Moreover, this algorithm is not suited for disk drive applications for the following reasons: even the smallest system process or m...

Ngày tải lên: 14/12/2013, 19:15

... generated by the data flex cable in the drive The high-frequency resonance modes of the microdrive as given in Chapter are included in simulation For hard disk drive servo systems, the task of the controller ... control toolkit using a practical example on a micro hard disk drive (HDD) servo system design The following dynamical model of an IBM microdrive (DMDM-10340) has bee...

Ngày tải lên: 14/12/2013, 19:15

... order of a few nanometers The servo bandwidth of the current disk drive actuators makes it very hard to achieve this The VCM actuator used in conventional disk drives has hundreds of flexible ... Trackfollowing servo systems have to ensure that the PES is kept to a minimum Having deviations that are above the tolerance of the disk drive would result in too many read or write er...

Ngày tải lên: 14/12/2013, 19:15

... Modeling and Design of a Microdrive System 9.1 Introduction Chapters to focus on the design of single- and dual-stage actuated hard drive servo systems The hard drives considered are those used ... as the VCM driver The VCM actuator is designed to position the R/W head fast and precisely 246 Modeling and Design of a Microdrive System onto the target track, and is driven by a VCM drive...

Ngày tải lên: 14/12/2013, 19:15

... application to hard disk drive servo system Proc 6th Int Workshop Adv Motion Contr; Nagoya, Japan; 2000 p 246–51 Hara S, Hara T, Yi L, Tomizuka M Two degree-of-freedom controllers for hard disk drives ... to hard disk drives Proc 1999 IEEE Int Conf Contr Appl; Kohala Coast, HI; 1999 p 170–5 13 Wang L, Yuan L, Chen BM, Lee TH Modeling and control of a dual actuator servo syst...

Ngày tải lên: 14/12/2013, 19:15

... control for hard disk dual-stage servo systems IEEE Trans Magn 2001; 37:949–54 161 Li Y, Horowitz R Track-following controller design of MEMS based dual-stage servos in magnetic hard disk drives Proc ... for fast and precise servo system of hard disk drives Proc 6th Int Workshop Adv Motion Contr; Nagoya, Japan; 2000 p 69–73 146 Tsuchiura KM, Tsukuba HH, Toride HO, Takahashi T...

Ngày tải lên: 14/12/2013, 19:15