In this paper, the characteristics and the applications of piezoelectric micro-displacement actuator are introduced, and the
actuation principle of the actuator is elaborated. Necessary experimental researches on the WTYD0808042 type
piezoelectric micro-displacement actuator have been made with self-designed output characteristics test system. The
displacement of actuator together with static and dynamic output characteristics of force have been tested respectively
under the conditions of free output of displacement, free output of force, and output of force-displacement coupling of
the actuator have also been tested. Based on the tests, the output displacement and force of actuator show the very good
linearity with the drive voltage in the 50V-160V area, a satisfied static response characteristic was obtained. Moreover, it
can be concluded that the actuator with the ideal characteristics of the transient output in displacement and force within
dynamic curve output coincidence good precision. The researches provide the reference for the actuator's application in
the turning vibration control system and the noncircular turning system.
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