Title: Resonance compensation in dual-stage hard disk drive servo system

Authors: Md. Arifur Rahman; Alamgir Hossain; Md. Raju Ahmed

Addresses: Department of Electrical and Electronic Engineering, Dhaka University of Engineering and Technology, Bangladesh ' Department of Electrical and Electronic Engineering, Dhaka University of Engineering and Technology, Bangladesh ' Department of Electrical and Electronic Engineering, Dhaka University of Engineering and Technology, Bangladesh

Abstract: To enhance the speed and precision, piezoelectric micro-actuator made form lead zirconate titanate (PZT) is used as the secondary actuator in dual-stage hard disk drive (HDD) where a voice coil motor (VCM) is used as the primary actuator. Both VCM actuator and PZT micro-actuator (MA) have the problem of mechanical resonance. Conventional approach is to use a pre-compensator notch filter to suppress the resonance. This method needs an accurate plant model, which is always difficult to obtain. On the other hand, a simple controller in the feedback path is a good solution for suppressing the resonance which does not require a very precise plant model. This paper presents a feedback resonant controller designed in simple way to suppress the resonance of PZT actuator. The design is based on a combined approach where M-norm minimisation and mixed passivity, negative-imaginary, small-gain theorem are used. Simulation results substantiate the effectiveness of the proposed controller.

Keywords: VCM actuator; PZT micro-actuator; resonant controller; dual-stage HDD.

DOI: 10.1504/IJAAC.2019.096414

International Journal of Automation and Control, 2019 Vol.13 No.1, pp.17 - 33

Received: 09 May 2017
Accepted: 20 Sep 2017
Published online: 28 Nov 2018 *

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