Improvement of miniaturized resonant type SIDM actuator

A smooth impact drive mechanism (SIDM) is a linear actuator which uses a friction force between a friction bar and a slider. In the previous researches, SIDM actuators were composed of a soft type multilayered piezoelectric element for generating a large piezoelectric displacement. It has a complex structure and the piezoelectric material has low Q value. To solve the problem we constructed the driving part with a hard type piezo element and utilized a combined resonant vibration for SIDM principle. It enables to drive an actuator with high speed efficiently. In this study, we propose to design a miniaturized resonant type SIDM actuator with a hard type single-layer piezoelectric element. Moreover, this study provides a method for adjusting the frequencies ratio by inserting an electrical inductor in series to the transducer. With the method, the ratio was successfully controlled as we expected.