1. ANALYSIS AND CONTROL OF THE ACTUATOR ROCKING MODE IN A HARD DISK DRIVE
- Author
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Xiong Liu, Choon Kiat Lim, and Joseph Cheng-Tsu Liu
- Subjects
Recording head ,Engineering ,business.industry ,Mechanical Engineering ,Mode (statistics) ,Aerospace Engineering ,Rotary actuator ,Servomechanism ,Magnetic flux ,Computer Science Applications ,law.invention ,Computer Science::Robotics ,Computer Science::Systems and Control ,Control and Systems Engineering ,law ,Control theory ,Signal Processing ,Head (vessel) ,Actuator ,business ,Servo ,Civil and Structural Engineering - Abstract
The recording head in a hard disk drive (HDD) is supported by an actuator assembly which is being controlled by a servo system. Structural resonance modes in the actuator impact the performance of the servo system. The actuator rocking mode has been identified as a major contributor to seek settling and hence, affects the servo stability. This paper presents the effect of actuator structure, skew angle and magnetic flux on the actuator rocking mode. A model to show the effect of the actuator rocking mode on the head motion was constructed to study the interaction with the control plant. The analysis was then verified with experiments. Excellent correlation was established between the experimental result and the theoretical model. Although the rocking mode cannot be eliminated, methods to suppress it are proposed based on the findings.
- Published
- 2002
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