2011
IMAACA 2011 Proceeding
Integrated Damping Parameters and Servo Controller Design for Optimal H2 Performance in Hard Disk Drives
Authors: Tingting Gao, Weijie Sun, Chunling Du, Lihua Xie
Abstract
Achieving the highest achievable tracks per inch (TPI) in hard disk drives (HDDs) is equivalent to minimize the H2 norm from the disturbances to the position error signals (PES). Thus the H2 optimal performance is a matter of great significance. This paper presents an integrated method of the plant and controller design sequentially to achieve an optimal H2 performance for voice coil motor (VCM) plant. The VCM plant is redesigned first to guarantee that the modified plant has a better H2 performance by using the linear matrix inequality (LMI) based approach. Then the H2 optimal controllers are designed for the modified plant. Finally, simulation results are presented to validate the effectiveness of the proposed modified plant redesign and the H2 optimal controller design method. It is found that the modified plant has a better H2 performance, higher bandwidth and phase margin than the original plant.
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