Structure design of an embedded annular ultrasonic motor based on in-plane vibration characteristics

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (10) : 127-139.

VIBRATION THEORY AND INTERDISCIPLINARY RESEARCH

Structure design of an embedded annular ultrasonic motor based on in-plane vibration characteristics

LI Zheng*，GAO Shuai，GAO Shihao，SUN Hexu

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Abstract

Compared with the chip type ultrasonic motor, the sandwich type ultrasonic motor has the advantages of good vibration characteristics, compact structure, strong environmental adaptability and high fatigue life, so it has been paid more and more attention in the design of ultrasonic motor. In order to make full use of the vibration characteristics of sandwich structure, an embedded annular ultrasonic motor based on in-plane vibration is proposed in this paper. By using the traveling wave generated on the ring stator, the inner and outer driving teeth of the stator can drive the designed flexible rotor on both sides. The flexible rotor can realize the pre-pressure compensation between the stator and the rotor and better fit the stator, so that the contact mode between the stator and the rotor can be changed into cylindrical contact. Changing the phase of the input two-phase voltage signal can realize the motor steering, and the ultrasonic motor can realize two different output modes by changing the fixed mode. In this paper, the overall structure, working principle and structure size design of the ultrasonic motor are introduced. After analyzing the influence of the stator structural parameters on the characteristic frequency, the interference mode separation is realized in the stator operating frequency band, and the simulation analysis of the ring stator is carried out, including the mode analysis, harmonic response analysis and vibration characteristic analysis. Finally, the feasibility and working principle of the proposed ultrasonic motor ring stator are verified by experiments.

Key words

In-plane vibration mode / double-sided drive / Embedded piezoelectric plate / Traveling wave rotary ultrasonic motor.

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LI Zheng, GAO Shuai, GAO Shihao, SUN Hexu. Structure design of an embedded annular ultrasonic motor based on in-plane vibration characteristics[J]. Journal of Vibration and Shock, 2025, 44(10): 127-139

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