TY - JOUR
AU - Liu, Yanning
AB - Piezoelectric actuators have been widely used in hard disk drives to form dual stage actuations for position control. Early designs, categorized as milli-actuators, typically place piezo elements on suspension base plate to swing suspension to induce motion of the head, located at the suspension tip. In recent years, micro-actuators with piezo elements next to the magnetic heads are introduced to improve positioning accuracy. These micro-actuators are first reviewed in this paper. An analytic model is then derived to understand key design parameters related to the micro-actuator performance and to compare designs. With the guidance of the model, the paper explores improvement directions for future micro-actuators. Combining the milli-actuator and micro-actuator to form triple stage actuations is shown to not only provide better position control accuracy than the dual stage actuations, but also expand micro-actuator design space for further performance enhancement, which provides a path for hard disk drive industry to keep growing track density for higher storage capacity.
TI - Advance piezo-actuator technologies for hard disk drive applications
JF - Microsystem Technologies
DO - 10.1007/s00542-023-05460-7
DA - 2023-08-01
UR - https://www.deepdyve.com/lp/springer-journals/advance-piezo-actuator-technologies-for-hard-disk-drive-applications-MqBZkcFhq6
SP - 1117
EP - 1127
VL - 29
IS - 8
DP - DeepDyve
ER -