Active actuation and control of a miniaturized suspension structure in hard-disk drives using a polyvinylidene-fluoride actuator and sensor

摘要

How to improve head-disk interface (HDI) characteristics in the mechanical design of hard-disk drives (HDDs) has become increasingly important due to the ever-growing demand for storage density and speed of access. In this paper, a means of active actuation and control of the suspension structure in HDDs is investigated and it is used to reduce head-disk friction/wear and to suppress induced vibrations. The analytical model for a cantilever-beam-like structure with the bonded piezo films is presented. A constant-gain velocity feedback control is proposed and its effectiveness in suppressing induced vibrations is demonstrated both theoretically and experimentally.