Abstract
Dual stage actuator (DSA) has been a critical component in hard disk drives to increase servo control bandwidth and thus storage capacity. The electrical properties of a typical DSA vary with the frequency, as piezoelectric materials (e.g., PZT) and electrically conductive adhesives (ECA) are commonly used. A circuit model is thus needed to capture such complexity for servo control design. In this paper, we review two typical DSA circuit designs and compare three circuit models with different simplifications. The model with parallel RC circuits can successfully capture DSA circuit characteristics up to 1 MHz. Impedance data measured from real parts show excellent agreement with simulation results based on the model. In addition, we investigate impacts of abnormal ECA on the overall DSA transfer function. This research can provide a practical yet valuable guideline for DSA related servo control.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.