Abstract
This study fabricated textures on the stator surface of a traveling wave ultrasonic motor (USM) using laser and investigated the tribological behavior of a polytetrafluoroethylene (PTFE) composite friction material and stator. Initially, the effect of textures with different densities was tested. As the results suggested, the generation of large transfer films of PTFE composite was prevented by laser surface texturing, and adhesive wear reduced notably despite the insignificant decrease in load capacity and efficiency. Next, the 100-h test was performed to further study the effects of texture. Worn surface and wear debris were observed to discuss wear mechanisms. After 100 h, the form of wear debris changed into particles. The wear mechanisms of friction material sliding against the textured stator were small size fatigue and slight abrasive wear. The wear height of friction material decreased from 3.8 μm to 1.1 μm. This research provides a method to reduce the wear of friction materials used in travelling wave USMs.
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Acknowledgements
We are grateful to the Natural Science Foundation of Zhejiang Province (No. LQ18E050002), Natural Science Foundation of Ningbo (No. 2017A610076) and Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms (No. BZ0388201702) for providing research funds and this study was sponsored by K. C.Wong Magna Fund in Ningbo University.
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Jinbang LI. He received his M.S. and Ph.D degrees in mechanical engineering from Harbin Institute of Technology, Harbin, China, in 2011 and 2016, respectively. He joined the School of Mechanical Engineering and Mechanics at Ningbo University from 2016. His research areas cover the tribological problems in ultrasonic motors, the development of polymer-based friction material and the effect of laser surface texturing on friction and wear of materials.
Shuaishuai ZENG. He is a graduate student of the School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, China. He is studying in the Precision Engineering Laboratory at the same university. His research interests include the tribological problems in ultrasonic motors.
Shuo LIU. He is a graduate student of the School of Mechanical Engineering and Mechanics, Ningbo University, Ningbo, China. He is studying in the Precision Engineering Laboratory at the same university. His research interests include ultrasonic motor and tribology.
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Li, J., Zeng, S., Liu, S. et al. Tribological properties of textured stator and PTFE-based material in travelling wave ultrasonic motors. Friction 8, 301–310 (2020). https://doi.org/10.1007/s40544-018-0253-3
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DOI: https://doi.org/10.1007/s40544-018-0253-3