Miniaturized electromechanical devices with multi-vibration modes achieved by orderly stacked structure with piezoelectric strain units

Jinfeng Liu, Xiangyu Gao (), Haonan Jin, Kaile Ren, Jingyu Guo, Liao Qiao, Chaorui Qiu, Wei Chen, Yuhang He, Shuxiang Dong, Zhuo Xu and Fei Li ()
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Jinfeng Liu: Xi’an Jiaotong University
Xiangyu Gao: Xi’an Jiaotong University
Haonan Jin: Xi’an Jiaotong University
Kaile Ren: Xi’an Jiaotong University
Jingyu Guo: Xi’an Jiaotong University
Liao Qiao: Xi’an Jiaotong University
Chaorui Qiu: Xi’an Jiaotong University
Wei Chen: OPPO Guangdong Mobile Communication Co., Ltd.
Yuhang He: OPPO Guangdong Mobile Communication Co., Ltd.
Shuxiang Dong: Peking University
Zhuo Xu: Xi’an Jiaotong University
Fei Li: Xi’an Jiaotong University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Piezoelectric devices based on a variety of vibration modes are widely utilized in high-tech fields to make a conversion between mechanical and electrical energies. The excitation of single or coupled vibration modes of piezoelectric devices is mainly related to the structure and property of piezoelectric materials. However, for the generally used piezoelectric materials, e.g., lead zirconate titanate ceramics, most of piezoelectric coefficients in the piezoelectric matrix are equal to zero, resulting in many piezoelectric vibration modes cannot be excited, which hinders the design of piezoelectric devices. In this work, an orderly stacked structure with piezoelectric strain units is proposed to achieve all nonzero piezoelectric coefficients, and consequently generate artificially coupled multi-vibration modes with ultrahigh strains. As an example, an orderly stacked structure with two piezoelectric strain units stator, corresponding to 31–36 coupled vibration mode, was designed and fabricated. Based on this orderly stacked structure with two piezoelectric strain units stator, we made a miniature ultrasonic motor (5 mmLength × 1.3 mmHeight × 1.06 mmWidth). Due to the ultrahigh strain of the 31–36 coupled vibration mode, the velocity per volume of the motor reached 4.66 s−1 mm−2. Furthermore, its moving resolution is around 3 nm, which is two orders higher than that of other piezoelectric motors. This work sheds a light on optimizing the performance of state-of-the-art electromechanical devices and may inspire new devices based on multi-vibration modes.

Date: 2022
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DOI: 10.1038/s41467-022-34231-7

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