Improved discrete proximate time optimal controller of a disk drive actuator

Author

Xiong, Yi ; Weerasooriya, Siri ; Low, Teck-Seng

Author_Institution

Data Storage Inst., Nat. Univ. of Singapore, Singapore

Volume

32

Issue

5

fYear

1996

fDate

9/1/1996 12:00:00 AM

Firstpage

4010

Lastpage

4012

Abstract

An important relationship between the acceleration discount factor and the closed loop control poles in a discrete Proximate Time Optimal Servo (PTOS) design has been established. This result enables the PTOS seek and tracking controllers to be designed and optimized independently without being constrained by boundary conditions. During subsequent merging, smooth transition from seek to tracking is obtained by linear, time shrinking of the boundary layer closer to the target track. The proposed controller is applied to R/W head actuation in a hard disk. Significant improvement in head settling is observed compared to conventional PTOS, specifically for longer seeks

Keywords

closed loop systems; discrete time systems; electric actuators; hard discs; magnetic heads; position control; servomechanisms; time optimal control; R/W head actuation; acceleration discount factor; boundary conditions; boundary layer; closed loop control poles; discrete proximate time optimal controller; disk drive actuator; hard disk; head settling; seek time; time shrinking; Acceleration; Boundary conditions; Constraint optimization; Design optimization; Disk drives; Hard disks; Merging; Optimal control; Servomechanisms; Target tracking;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.539247

Filename

539247