Title :
Mid-frequency disturbance rejection via micro-actuator in dual-stage HDD
Author :
Daowei Wu ; Guoxiao Guo ; Chong, T.C.
Author_Institution :
Date Storage Inst., Singapore, Singapore
Abstract :
Summary form only given. The mid-frequency disturbance (1/spl sim/3 kHz) due to disk flutter with higher rotational speed becomes one of the major contributors to TMR. The disturbance shows as slim and high spikes in the spectrum but is non-synchronous to the rotation. This paper presents a dual-stage control design with peak filter to reject mid-frequency disturbance. The technique of state initialization is proposed to improve transient response when the peak filter is switched on.
Keywords :
disc drives; hard discs; microactuators; transient response; tunnelling magnetoresistance; 1 to 3 kHz; TMR; disk flutter; dual-stage HDD; dual-stage control design; micro-actuator; mid-frequency disturbance; mid-frequency disturbance rejection; nonsynchronous disturbance; peak filter; rotational speed; state initialization technique; transient response; Filters; Frequency; Hard disks; Magnetic films; Magnetic heads; Microactuators; Open loop systems; Piezoelectric actuators; Sputtering; Transient response;
Conference_Titel :
Magnetics Conference, 2002. INTERMAG Europe 2002. Digest of Technical Papers. 2002 IEEE International
Conference_Location :
Amsterdam, The Netherlands
Print_ISBN :
0-7803-7365-0
DOI :
10.1109/INTMAG.2002.1000877
