A life test of ultrasonic motors under different torque loads and the analysis of the characteristics of wearing surfaces

Without a coil and a gearbox, an ultrasonic motor has an important application in space engineering and so forth with advantages of light weight, small volume, less electromagnetic radiation, fast dynamic response, and high energy density. However, the obvious friction and wear between the stator an...

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Bibliographic Details
Published in:Proceedings of the Institution of Mechanical Engineers. Part J, Journal of engineering tribology Journal of engineering tribology, 2020-05, Vol.234 (5), p.770-777
Main Authors: Zhang, Liwei, Zheng, Huiming, Huang, Shouqing, Zhang, Wu, Li, Fangyong, Liu, Dazhi
Format: Article
Language:English
Subjects:
Coils
Component reliability
Dynamic response
Electromagnetic radiation
Failure mechanisms
Flux density
Frequency response
Friction
Gearboxes
Loads (forces)
Mechanical engineering
Meshing
Motors
Stators
Torque
Ultrasonic testing
Wear mechanisms
Weight reduction
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Summary:Without a coil and a gearbox, an ultrasonic motor has an important application in space engineering and so forth with advantages of light weight, small volume, less electromagnetic radiation, fast dynamic response, and high energy density. However, the obvious friction and wear between the stator and the friction material (as a part of the shaft assembly) restrict the reliability and life time of the ultrasonic motor. In this paper, a life test of ultrasonic motors is designed and carried out for 3041.7 h, and the eight motors are divided into four groups with torque loads of 0.03 Nm, 0.09 Nm, 0.16 Nm, and 0.21 Nm in the test. The evolution characteristics of the displacement frequency response and the wear on the stator contact surface under different torque loads during the wear process are analyzed. Some start-up problems occur during the early time in the life test are found and explained based on a meshing effect between the stator and the friction material, and some targeted suggestions are proposed to overcome the problems. The study can help to understand the wear failure mechanism and characteristics of ultrasonic motors.
ISSN:1350-6501
2041-305X
DOI:10.1177/1350650119871803