... texturing process significantly increases the interfacial coefficient of friction ( COF ) by 34.36%. By optimizing the preload, the motor’s energy conversion efficiency improves by 5%. Notably, under a preload of 240 N, the optimal output characteristics are achieved, with the energy conversion efficiency...

... friction material improved the TRUM-60 output performance, resulting in a maximum energy conversion efficiency of 57.11%. However, a textured stator degraded the TRUM-60 output performance, resulting in a minimum energy conversion efficiency of only 44.92%. Originality/value The results of this study...

...Xiaoliang Liu; Jinhao Qiu; Gai Zhao Purpose This paper aims to investigate the effect of frictional materials and surface texture on the energy conversion efficiency and the mechanical output performance of the ultrasonic motor (USM). Design/methodology/approach A newly designed testing system...