A proposal of a piezo rotary positioning device: design, modeling and experiments

• Published in: Smart materials and structures 2019-11, Vol.28 (11), p.115032
• Main Authors: Le, Truyen, Danh, L T, Jeon, J U
• Format: Article
• Language: English
• Subjects: friction drive mechanism; impact drive mechanism; piezoactuators; ultra precision positioning
• ISSN: 0964-1726; 1361-665X
• DOI: 10.1088/1361-665X/ab4736

This article proposes a novel piezo rotary positioning device in which the rotation of the end-effector is generated by the friction driving mechanism principle. Two piezoelectric elements are utilized as motion sources. In this article, a complete study for design, finite element analysis, manufacturing, dynamic model, simulations and experiments is presented. The finite element analysis is applied to evaluate the designed device. Based on results of analysis on the finite element model, a prototype of device is manufactured. The driving resolutions of the end-effector of prototype can be achieved approximately 0.45 × 10-3 rad when the driving voltage of 80 V with frequency of 1 Hz is applied. By taking in account of the nonlinear hysteresis of piezo actuators as well as the complexity of friction mechanism between the end-effector and the movable platform, the predicted dynamic model of the end-effector angular displacement is achieved. Simulations and experiments results show that the prediction model is in good agreement with the actual model. This provides a useful solution for designing and controlling of such rotary devices. So, this rotary device can be controlled automatically by a computer and it has a great potential application in practice.