Contact analysis and modeling of a linear ultrasonic motor with a threaded output shaft
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This paper presents a contact analysis and a mathematical model for a linear ultrasonic motor with a threaded output shaft. The motor utilizes an out-of-plane traveling wave and an in-plane traveling wave to drive the output shaft. Two kinds of contacts are analyzed and modeled respectively. A numerical model is developed to predict the performance and behavior of the motor, including the no-load speed, the maximum driving force, the maximum output power, and the effects of the thread pitch, the dynamic friction coefficient, the mean thread radius on motor performance. A prototype motor is fabricated and experimental testing is performed to compare the experimental results with the predictions from models. The model developed here can be used as a design tool for designing and optimizing the linear ultrasonic motor with a threaded output shaft.
KeywordsUltrasonic motor Linear motion Contact analysis Modeling
This work was supported by National Natural Science Foundation of China (50735002), National High Technology Research and Development of China 863 Program (2007AA04Z212), China Postdoctoral Science Foundation Funded Project (20100480581, 201104252), Shanghai Postdoctoral Scientific Program (11R21413400).
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