三稳态压电-电磁复合能量采集器性能研究

为了提高双稳态压电电磁复合能量采集器(BPEEH)的能量转换性能和转换效率，该文在典型BPEEH的基础上，提出了一种新颖的三稳态压电电磁复合能量采集器(TPEEH)。与传统的BPEEH相比，其兼有一个新颖的电磁发电装置，进一步构成三稳态系统。该文通过对TPEEH结构装置建立数学模型，进行了数值分析，并得到该采集器系统的势能变化函数。在此基础上，通过实验验证了外界激励频率、磁铁间距及电路负载电阻对该采集器输出电压和功率的影响。实验结果表明，当磁距为16 mm，外部磁间距为26 mm，外部激励频率为10.2 Hz时，TPEEH采集器有最大的输出电压(为6.348 9 V)，同时在外部负载电阻为500 Ω时，采集器获得最大输出功率(为0.08 W)。与传统的BPEEH采集器相比，TPEEH采集器的采集谐振频率低，采集频带宽，输出电压和功率高，从而提高了能量转换性能和效率。

Abstract

In order to improve the energy conversion performance and conversion efficiency of the bistable piezoelectromagnetic complex energy harvester(BPEEH), a novel tristable piezoelectromagnetic complex energy harvester(TPEEH) is proposed on the basis of the typical BPEEH, which has a novel electromagnetic power generation device to further constitute the tristable system compared with the traditional BPEEH. In this paper, a mathematical model of the TPEEH structural device is developed and numerical analysis is performed to obtain the potential energy change function of the harvester system. Based on this, the effects of external excitation frequency, magnet spacing, and circuit load resistance on the output voltage and power of this collector were further verified experimentally. The experimental results show that the TPEEH collector has a maximum output voltage of 6.348 9 V under this condition when the magnetic distance is 16 mm, the external magnetic spacing is 26 mm, and the external excitation frequency is 10.2 Hz, while the collector obtains a maximum output power of 0.08 W when the external load resistance is 500 Ω. Therefore, compared with the conventional BPEEH collector, the TPEEH collector has the advantages of lower acquisition resonant frequency, wider acquisition band, and higher output voltage and power, which further improves the energy conversion performance and efficiency.

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彭召洋, 宋芳, 熊玉仲. 三稳态压电-电磁复合能量采集器性能研究[J]. 压电与声光, 2023, 45(6): 872. PENG Zhaoyang, SONG Fang, XIONG Yuzhong. Research on a Tristable Piezoelectric-Electromagnetic CompositeEnergy Harvesters[J]. Piezoelectrics & Acoustooptics, 2023, 45(6): 872.

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