Title :
A phase-stabilized servo controller for dual-stage actuators in hard disk drives
Author :
Kobayashi, M. ; Nakagawa, S. ; Nakamura, S.
Author_Institution :
Mech. Eng. Res. Lab., Hitachi Ltd., Ibaraki, Japan
Abstract :
A design of a phase-stabilized servo controller based on a Nyquist plot for a moving-suspension-type dual-stage actuator is proposed. The phase-stabilized servo controller utilizes suspension resonances of a PZT actuator to compensate track misregistration (TMR) due to windage disturbances excited by suspension vibration. Experimental results on a prototype 3.5-inch hard disk drive show that the cross-over frequency is 2.0 kHz and the windage disturbances are reduced by 23% compared to a conventional notch-based dual-stage controller.
Keywords :
Nyquist diagrams; compensation; disc drives; feedback; hard discs; magnetic heads; piezoelectric actuators; position control; servomechanisms; vibrations; 2 kHz; 3.5 in; Nyquist plot; PZT; PZT actuator; PbZrO3TiO3; cross-over frequency; decoupled feedback control; dual-stage actuators; hard disk drives; moving-suspension-type dual-stage actuator; notch-based dual-stage controller; phase-stabilized servo controller; suspension resonances; suspension vibration; track misregistration compensation; windage disturbances; Actuators; Bandwidth; Frequency; Hard disks; Laboratories; Mechanical engineering; Microactuators; Resonance; Servomechanisms; Wind energy;
Conference_Titel :
Magnetic Recording Conference, 2002. Digest of the Asia-Pacific
Conference_Location :
Singapore
Print_ISBN :
0-7803-7509-2
DOI :
10.1109/APMRC.2002.1037635
