基于压电简支梁拉伸调频的旋磁发电机

摘要/Abstract

摘要： 为提高旋转式压电发电机的可靠性以及拓宽其有效转速带宽，提出了一种基于压电简支梁拉伸调频的旋磁发电机。介绍了所提发电机的结构原理，研究了动磁铁数量、压电振子预压量等因素对发电机发电性能及固有频率的影响规律。试验结果表明：发电机在转速范围内存在多个使电压出现峰值的最佳转速，各个最佳转速的数值随预压量的增大而增大，且最佳转速的数量随动磁铁数的增加而减少；调节预压量可拓宽发电机的有效转速范围，如动磁铁数为8时，当预压量为0时，发电机仅在几个谐振点达到电压要求，当预压量为1 mm、3 mm、5 mm时，有效转速范围分别扩大至321~768 r/min、160~1 000 r/min、123~1 000 r/min；该发电机固有频率可在37.33~89.60 Hz范围内进行调整，对应的转速调节范围为280~2 632 r/min。

关键词: 压电发电机, 调频, 固有频率, 旋磁激励, 能量回收

Abstract: To improve the reliability and broaden the effective speed bandwiths of rotary piezoelectric generators, a rotary magnet-coupled generator with the frequency adjustment using the extensions of a piezoelectric simply-supported beam was presented. The structures and working principles of the proposed generator were demonstrated, the influences of the number of rotating magnets and the precompression amounts of the piezoelectric beam vibrator on the power-generation performance and natural frequency were studied. The testing results show that there are multiple optimal speeds enable the generated voltage to reach the peak．The values of all the optimal speeds are increased with the increasing of precompression amounts, and the numbers of optimal speeds are decreased with the increasing of the number of rotating magnets. The effective speed ranges may broaden through adjusting the precompression amounts. If the number of rotating magnets is as 8，when the precompression amount is as 0, the generator may meet the voltage requirements only at several resonance points. However, when the precompression amounts are as 1 mm,3 mm,5 mm, the effective speed ranges may be broaden to 321~768 r/min, 160~1 000 r/min, 123~1 000 r/min, respectively. The natural frequency of generator may be adjusted in the range of 37.33~89.60 Hz, and the corresponding speed range is as 280~2 632 r/min.

Key words: piezoelectric generator, frequency adjustment, natural frequency； rotary magnet-coupled excitation； energy harvester

中图分类号:

TN384
TM619

阚君武;何恒钱;王淑云;廖卫林;张忠华;陈松;吴亚奇. 基于压电简支梁拉伸调频的旋磁发电机[J]. 中国机械工程.

KAN Junwu;HE Hengqian;WANG Shuyun;LIAO Weilin;ZHANG Zhonghua;CHEN Song;WU Yaqi. Rotary Magnet-coupled Generator with Frequency Adjustment Using Extensions of a Piezoelectric Simply-supported Beam[J]. China Mechanical Engineering.

参考文献

[1]杨斌强, 徐文潭, 陆国丽,等. 宽频压电振动能量采集器的分布参数模型与实验[J]. 中国机械工程, 2017, 28(2):127-134.
YANG Binqiang, XU Wentan, LU Guoli, et al. Distributed Parameter Model and Experiments of a Broadband Piezoelectric Vibration Energy Harvester[J].China Mechanical Engineering, 2017, 28(2):127-134.
[2]阚君武,张肖逸,王淑云,等.一种错位旋磁激励压电俘能器[J]. 中国机械工程, 2016, 27(16):2207-2210.
KAN Junwu, ZHANG Xiaoyi, WANG Shuyun, et al. A Piezoelectric Harvester Excited by Malposed Rotary Magnets[J]. China Mechanical Engineering, 2016, 27(16):2207-2210.
[3]WU X, LEE D W. Miniaturized Piezoelectric Energy Harvester for Battery-free Portable Electronics[J]. International Journal of Energy Research, 2019, 43(6):2402-2409.
[4]LI X, UPADRASHTA D, YU K, et al. Analytical Modeling and Validation of Multi-mode Piezoelectric Energy Harvester[J]. Mechanical Systems and Signal Processing, 2019, 124:613-631.
[5]CHOI Y M, LEE M, JEON Y. Wearable Biomechanical Energy Harvesting Technologies[J]. Energies, 2017, 10(10):1483.
[6]FAN K, LIU Z, LIU H, et al. Scavenging Energy from Human Walking through a Shoe-mounted Piezoelectric Harvester[J]. Applied Physics Letters, 2017, 110(14):143902.
[7]XIE Z, KWUIMY C A K, WANG Z, et al. A Piezoelectric Energy Harvester for Broadband Rotational Excitation Using Buckled Beam[J]. AIP Advances, 2018, 8(1):015125.
[8]VIET N V, AL-QUTAYRI M, LIEW K M, et al. An Octo-generator for Energy Harvesting Based on the Piezoelectric Effect[J]. Applied Ocean Research, 2017, 64:128-134.
[9]BAO C, DAI Y, WANG P, et al. A Piezoelectric Energy Harvesting Scheme Based on Stall Flutter of Airfoil Section[J]. European Journal of Mechanics-B/Fluids, 2019, 75:119-132.
[10]ZHAO Liya, YANG Yaowen. Toward Small-scale Wind Energy Harvesting:Design, Enhancement, Performance Comparison, and Applicability[J]. Shock and Vibration, 2017, 2017:1-31.
[11]ZOU H X, ZHANG W M, LI W B, et al. Design and Experimental Investigation of a Magnetically Coupled Vibration Energy Harvester Using Two Inverted Piezoelectric Cantilever Beams for Rotational Motion[J]. Energy Conversion & Management, 2017, 148:1391-1398.
[12]ZHANG J, FANG Z, SHU C, et al. A Rotational Piezoelectric Energy Harvester for Efficient Wind Energy Harvesting[J]. Sensors and Actuators A:Physical, 2017, 262:123-129.
[13]ZHANG H, JIANG S, HE X. Impact-based Piezoelectric Energy Harvester for Multidimensional, Low-level, Broadband, and Low-frequency Vibrations[J]. Applied Physics Letters, 2017, 110(22):18-27.
[14]KAN J, FU J, WANG S, et al.Study on a Piezo-disk Energy Harvester Excited by Rotary Magnets[J]. Energy, 2017, 122:62-69.
[15]阚君武, 于丽, 王淑云,等. 旋磁激励式压电悬臂梁发电机性能分析与试验[J]. 机械工程学报, 2014, 50(8):144-149.
KAN Junwu, YU Li, WANG Shuyun, et al. Performance Analysis and Test of Piezo-cantilever Generator Excited by Rotary Magnet[J]. Journal of Mechanical Engineering, 2014, 50(8):144-149.
[16]MORRIS D J, YOUNGSMAN J M, ANDERSON M J, et al. A Resonant Frequency Tunable, Extensional Mode Piezoelectric Vibration Harvesting Mechanism[J]. Smart Materials & Structures, 2008, 17(6):065021.
[17]LALLART M, ANTON S R, INMAN D J. Frequency Self-tuning Scheme for Broadband Vibration Energy Harvesting[J]. Journal of Intelligent Material Systems and Structures, 2010, 21(9):897-906.
[18]CHALLA V R, PRASAD M G, FISHER F T. Towards an Autonomous Self-tuning Vibration Energy Harvesting Device for Wireless Sensor Network Applications[J]. Smart Materials & Structures, 2011, 20(2):25004-25011.
[19]刘鸿文. 高等材料力学[M]. 北京:高等教育出扳社, 1985：37-47.
LIU Hongwen. Advanced Material Mechanics[M]. Beijing:Higher Education Press, 1985:37-47.