This article introduces a method of enhancing the energy conversion efficiency of a traveling wave rotary ultrasonic motor with a flexible rotor by increasing the friction coefficient at the stator–rotor interface. The increased friction coefficient leads to improvements in energy conversion efficiency by increasing the output power and reducing friction loss power. Experimental verification showed that the friction coefficient in the interface increased from 0.21 to 0.32, the maximum energy conversion efficiency increased from 36.8% to 46.3%, and the interface friction loss was reduced.
BalGBekirogluE (2005) A highly effective load adaptive servo drive system for speed control of travelling-wave ultrasonic motor. IEEE Transactions on Power Electronics20(5): 1143–1149.
2.
ChenHHanWQiuJ (2020b) Investigation on the traveling wave and three-dimensional trajectory of motion on the stator of rotational ultrasonic motors. International Journal of Applied Electromagnetics and Mechanics64(1-4): 631–638.
3.
ChenHNieRHanW, et al. (2022) Improvement mechanism of energy conversion efficiency in ultrasonic motor with flexible rotor. Ultrasonics120: 106659.
4.
ChenNFanSFanD (2020a) A multi-parameter driving and measurement circuit of ultrasonic motor. IOP Conference Series Materials Science and Engineering768(6): 062011.
5.
ChenNZhengJJiangX, et al. (2020c) Analysis and control of micro-stepping characteristics of ultrasonic motor. Frontiers in Mechanical Engineering15(4): 585–599.
KubotaTKuniiYKurodaY; Working Group (2005) Japanese lunar robotics exploration by co-operation with lander and rover. Journal of Earth System Science114(6): 777–785.
8.
LiSYangRWangT, et al. (2020a) Surface textured polyimide composites for improving conversion efficiency of ultrasonic motor. Tribology International152: 106489.
9.
LiJZengSLiuS, et al. (2020b) Tribological properties of textured stator and PTFE-based material in travelling wave ultrasonic motors. Friction8(2): 301–310.
10.
LiuJNiuZJZhuH, et al. (2019) Design and experiment of a large-aperture hollow traveling wave ultrasonic motor with low speed and high torque. Applied Sciences9(19): 3979.
11.
LiuXQiuJZhaoG (2018) Improved energy conversion efficiency of the ultrasonic motor with surface texture. Industrial Lubrication and Tribology70(9): 1729–1736.
12.
MaenoTTsukimotoTMiyakeA (1990)) The contact mechanism of an ultrasonic motor. In: IEEE 7th international symposium on applications of ferroelectrics, 535–538. New York: IEEE.
13.
MaenoTBogyDB (1993) Fe analysis and LDA measurement of the dynamic rotor/stator contact in a ring-type ultrasonic motor. Journal of Tribology115(4): 625–631.
14.
Mohd RomlayFRWan YusoffWAMat PiahKA (2016) Increasing the efficiency of traveling wave ultrasonic motor by modifying the stator geometry. Ultrasonics64: 177–185.
15.
MustafaAMoritaT (2019a) Dynamic preload control of traveling wave rotary ultrasonic motors for energy efficient operation. Japanese Journal of Applied Physics58(SG): SGGD04.
16.
MustafaAMoritaT (2019b) Efficiency optimization of rotary ultrasonic motors using extremum seeking control with current feedback. Sensors and Actuators A Physical289: 26–33.
17.
QiuWMizunoYKoyamaD, et al. (2013) Efficiency improvement of hybrid transducer-type ultrasonic motor using lubricant. IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control60(4): 786–794.
18.
QuJGuoWWangY (2013) Effects of wear of friction material on performance of ultrasonic motor. Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology227(4): 362–372.
19.
QuJSunFZhaoC (2006) Performance evaluation of traveling wave ultrasonic motor based on a model with visco-elastic friction layer on stator. Ultrasonics45(1-4): 22–31.
20.
SashidaTKenjoT (1993) An Introduction to Ultrasonic Motors. Oxford: Clarendon Press.
21.
ShiWZhaoHMaJ, et al. (2017) An optimum-frequency tracking scheme for ultrasonic motor. IEEE Transactions on Industrial Electronics64(6): 4413–4422.
22.
StorckHWallaschekJ (2003) The effect of tangential elasticity of the contact layer between stator and rotor in travelling wave ultrasonic motors. International Journal of Non-Linear Mechanics38(2): 143–159.
WallaschekJ (1998) Contact mechanics of piezoelectric ultrasonic motors. Smart Materials and Structures7(3): 369–381.
25.
ZengWPanSChenL, et al. (2020) Research on ultra-low speed driving method of traveling wave ultrasonic motor for CMG. Ultrasonics103: 106088.
26.
ZhangJYangLMaC, et al. (2019) Improving efficiency of traveling wave rotary ultrasonic motor by optimizing stator. Review of Scientific Instruments90(5): 056104.
ZhouYChangJLiaoX, et al. (2020) Ring-shaped traveling wave ultrasonic motor for high-output power density with suspension stator. Ultrasonics102: 106040.
