Title: Suppression of resonance in hard disk drive servo system with feedback resonant controller: a benchmark model study

Authors: Md. Arifur Rahman; Abdullah Al Mamun; Kui Yao

Addresses: Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117576, Singapore ' Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117576, Singapore ' Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, 117602, Singapore

Abstract: In order to achieve the precision desired, the bandwidth of the read-write head positioning servomechanism of hard disk drive (HDD) is required to be very high to minimise the effects of external disturbances. However, any attempt to increase the bandwidth is hindered by increased gain in frequencies of mechanical resonances leading to oscillatory response. If not compensated properly, excessive or unbounded oscillation may even lead to instability. Cascade compensation is the popular method for compensating multiple resonant modes. However, this method requires a very precisely identified plant model. On the contrary, feedback controller works better in such situation which does not require a very accurate plant model. This paper presents a feedback resonant controller designed in a simple way to suppress the resonant modes of voice coil motor (VCM) actuator used in HDD servo system. Simulation results substantiate the effectiveness of the proposed design methodology.

Keywords: voice coil motor; VCM actuators; resonance suppression; notch filters; lag-lead controllers; hard disk drives; HDD servo systems; feedback resonant controllers; benchmark models; feedback control; simulation.

DOI: 10.1504/IJMIC.2016.078325

International Journal of Modelling, Identification and Control, 2016 Vol.26 No.2, pp.171 - 184

Received: 15 Apr 2015
Accepted: 29 May 2015
Published online: 15 Aug 2016 *

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