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.

中文翻译：

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行波超声电机中带纹理的定子和PTFE基材料的摩擦学性能

这项研究使用激光在行波超声电机（USM）的定子表面上制作了织构，并研究了聚四氟乙烯（PTFE）复合摩擦材料和定子的摩擦学行为。最初，测试了不同密度的纹理效果。结果表明，尽管负载能力和效率没有显着降低，但通过激光表面纹理化可防止大的PTFE复合膜转移膜的产生，并且显着降低了粘合剂的磨损。接下来，进行了100小时的测试以进一步研究纹理的影响。观察磨损的表面和磨损碎屑以讨论磨损机理。100小时后，磨损碎片的形式变为颗粒。摩擦材料在带纹理的定子上滑动的磨损机制是小尺寸疲劳和轻微的磨料磨损。摩擦材料的磨损高度从3.8μm降至1.1μm。这项研究提供了一种减少行波USM中使用的摩擦材料磨损的方法。