Abstract
Hard contact materials, such as AL2O3 ceramic, have been used widely to improve motion accuracy of linear ultrasonic motors (LUSM). Nevertheless, experimental results show that, for this kind of LUSM, the contact frequency between the stator and the slider is far less than the frequency of the driving signals, which prevents the vibration energy of the stator from being utilized fully. However, almost all existing theoretical models assume that the stator and slider will come into contact in each driving signal cycle, which lead to the great difference between the theoretical results and the actual situation. In order to solve this problem, theoretical analysis and experimental investigation on the micro-impact processes of hard contact materials linear ultrasonic motors (HLUSM) are conducted in this research. Some parameters, which are closely related to the contact state, have been investigated through modelling the high frequency micro-amplitude contact behaviour on the contact interface in normal direction. It is found that the stiffness of the stator supporting spring, the high frequency vibration amplitude of the driving tip and the low-frequency response amplitude of the stator centre of mass (COM) are important factors affecting the contact frequency. Simulation and experimental results show that increasing the value of the stiffness of the stator supporting spring and decreasing the amplitude of the low-frequency response of stator COM can improve the contact frequency. Moreover, experimental results show that the output power of the linear ultrasonic motor is effectively improved in the ideal contact state. The efficiency is improved by approximately 50 %.
Similar content being viewed by others
References
J. Wallaschek, Contact mechanics of piezoelectric ultrasonic motors. Smart Mater. Struct. 7, 369 (1998)
T. Sattel, P. Hagedom, J. Schmidt, The contact problem in ultrasonic traveling-wave motors. J. Appl. Mech.-T ASME 77, 31014 (2010)
B. Radi, A. El Hami, The study of the dynamic contact in ultrasonic motor. Appl. Math. Model. 34(12), 3767–3777 (2010)
J. Jin, C. Zhao, Characteristic matching between stator and rotor in standing-wave-type ultrasonic motors. J. Electroceram. 20(3), 197–202 (2008)
M. Houben, W. Van de Vijver, F. Al-Bender et al., A generic modelling approach for studying the contact mechanism and dynamic behavior of bimodal standing wave piezomotors. Proceedings of the euspen International Conference, Zurich, 227–231 (2008)
S.T. Ho, Modelling of the linear ultrasonic motor using an elliptical shape stator. IEEE International conference on Mechatronics, 82–87 (2006)
Y. Shi, C. Zhao, J. Zhang, Contact analysis and modeling of standing wave linear ultrasonic motor. J. Wuhan Univ. Technol.-Mater. Sci. Ed. 26(6), 1235–1242 (2011)
J. Twiefel, C. Potthast, M. Mracek, T. Hemsel, T. Sattel, J. Wallaschek, Fundamental experiments as benchmark problems for modeling ultrasonic micro-impact processes. J. Electroceram. 20(3), 209–214 (2008)
W. Wurpts, J. Twiefel, An ultrasonic motor with intermittent contact modeled as a two degree of freedom oscillator in time domain. Proc. Appl. Math. Mech. 9(1), 287–288 (2009)
Acknowledgments
The authors are grateful of the National Sciences Foundation of China (No.91023020) and National Sciences Foundation – Guangdong Natural Science Foundation, China (No.U0934004).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wang, J., Jin, J. & Zhao, C. The contact problem of hard contact materials linear ultrasonic motors. J Electroceram 31, 21–27 (2013). https://doi.org/10.1007/s10832-013-9807-y
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10832-013-9807-y