Dynamic analysis and efficiency optimization on the transmission interface of adisc traveling wave piezoelectric motor

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (10) : 271-277.

SHI Mingyou, CHEN Chao, WANG Junshan

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Abstract

While traveling wave is excited in the stator of a disc piezoelectric motor, the resulted three-dimensional oblique ellipse motion is produced at the friction interface between the stator and the rotor.In this case the radial component of the elliptical motion will lead to pure friction loss and transmission efficiency reduction.The kinematics characteristics of the vibration response of the disc piezoelectric stator were investigated.It was proposed that the stator with teeth was modeled by a teeth structure attached to the main substrate.The vibration equation of the stator was derived by the dynamic substructure method and finite element method, and the particle on the driving surface of stator teeth was analyzed.It is pointed out that the proportion of the displacement component in the radial direction can be reduced by the structural parameters design of the teeth. As an example the teeth of some kind of disc piezoelectric motor were optimized in order to obtain the best transmission efficiency of the contact interface between the stator and rotor.The parameters with better output efficiency were achieved by a series of iteration.The output characteristics of the piezoelectric motor with optimal parameters were computed and analyzed by comparison with those of other parameters.The prototype of the disk piezoelectric motor with specific parameters was manufactured.It is proved that the structural parameters of stator teeth have a considerable effect on the power loss owing to the radial sliding on the friction interface.Under the same excitation conditions, the excellent output efficiency can be achieved by using the stator with the optimal parameters group.

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disk / traveling wave / piezoelectric motor / friction / radial slide

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SHI Mingyou, CHEN Chao, WANG Junshan. Dynamic analysis and efficiency optimization on the transmission interface of adisc traveling wave piezoelectric motor[J]. Journal of Vibration and Shock, 2021, 40(10): 271-277

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