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Tribological properties of textured stator and PTFE-based material in travelling wave ultrasonic motors

  • Jinbang LiEmail author
  • Shuaishuai Zeng
  • Shuo Liu
  • Ningning Zhou
  • Tao Qing
Open Access
Research Article


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.


laser surface texturing ultrasonic motor PTFE-based material friction wear mechanisms 



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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Authors and Affiliations

  • Jinbang Li
    • 1
    Email author
  • Shuaishuai Zeng
    • 1
  • Shuo Liu
    • 1
  • Ningning Zhou
    • 2
  • Tao Qing
    • 2
  1. 1.Faculty of Mechanical Engineering and MechanicsNingbo UniversityNingboChina
  2. 2.Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission MechanismsBeijing Institute of Control EngineeringBeijingChina

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