Influence of NRMs on energy-generation performance of piezoelectric harvesters

KAN Jun-wu; LI Yang; WANG Shu-yun; WANG Bin; SHEN Ya-lin; LI Sheng-jie

doi:10.3788/OPE.20142207.1864

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Influence of NRMs on energy-generation performance of piezoelectric harvesters

更新时间：2020-08-13

- Influence of NRMs on energy-generation performance of piezoelectric harvesters
- Optics and Precision Engineering Vol. 22, Issue 7, Pages: 1864-1870(2014)
- 作者机构：
  
  浙江师范大学精密机械研究所,浙江金华,321004
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20142207.1864
  CLC： TN384;TM619
- Received：28 November 2013，
  
  Revised：16 January 2014，
  
  Published：25 July 2014
- 稿件说明：
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阚君武, 李洋, 王淑云*等. 旋转激励磁铁数对压电俘能器输出性能的影响[J]. 光学精密工程, 2014,22(7): 1864-1870

KAN Jun-wu, LI Yang, WANG Shu-yun* etc. Influence of NRMs on energy-generation performance of piezoelectric harvesters[J]. Editorial Office of Optics and Precision Engineering, 2014,22(7): 1864-1870
阚君武, 李洋, 王淑云*等. 旋转激励磁铁数对压电俘能器输出性能的影响[J]. 光学精密工程, 2014,22(7): 1864-1870 DOI： 10.3788/OPE.20142207.1864.

KAN Jun-wu, LI Yang, WANG Shu-yun* etc. Influence of NRMs on energy-generation performance of piezoelectric harvesters[J]. Editorial Office of Optics and Precision Engineering, 2014,22(7): 1864-1870 DOI： 10.3788/OPE.20142207.1864.

摘要

考虑现有旋转发电机无法适应高/匀速旋转运动且振动冲击/ 噪音大、可靠性低等弊端，提出了一种由旋转磁铁激励的压电俘能器，并从理论及试验两方面研究了旋转磁铁数量（间距）对激振力及压电振子发电特性的影响规律。结果表明，在其它条件确定的情况下，存在使激振力最大的最佳旋转磁铁间隙比（磁铁直径与相邻磁铁间距离之比）；间隙比为2时的激振力幅值为间隙比为0和4时的6.2倍。采用2，12，24个旋转磁铁激励发电时，电压-转速特性曲线中均存在多个使输出电压出现峰值的最佳转速，其中最大峰值电压及其所对应的最佳转速分别为29.4，87.2，28.4 V和1 282.5，707.5，2451 rmin

-1

；12个旋转磁铁激励的最大输出电压为其它两种情况的3倍。此外，压电振子一次激励所生成电能（波形数量及幅值）还与旋转磁铁数量及转速有关。2个旋转磁铁在低转速时仅能激励出1个较大幅值电压波形，而高转速时可生成4个幅值较大的自由振荡波形；12个磁铁在任何转速下都仅能激励出1个电压波形。实验显示动磁铁数量是影响旋转压电俘能器发电量及输出功率的关键要素。

Abstract

As existing rotating generators can not adapt to a high speed shock and vibration and have higher noise and lower reliability

this paper proposes a piezoelectric energy harvester excited by rotating magnets.The influence of the number of the rotating magnets (NRMs) on the exciting force as well as the output voltage of the piezoelectric harvester is investigated theoretically and experimentally.The results show that there is an optimal gap ratio (the gap

between two adjacent magnets to the magnet diameter) for the excitation force to achieve maximum.The obtained excitation force at

=2 is 6.2 times that at

=0 and

=4.When the voltage generation exited with 2

24 rotating magnets in the experiments

there are several optimal rotating speeds for the generated voltages to achieve the peak.The maximal peak voltages and the relative optimal speeds for 2

24 rotating magnets are 29.4

87.2

28.4 V and 1 282.5

2 707.5

2 451 rmin

-1

respectively.The maximal voltage generated under 12 rotating magnets is about 3 times those under other excitation conditions.The voltage waveform generated from the piezoelectric harvester under one excitation depends on the NRMs and rotating speeds.For 2 rotating magnets

the number of voltage waveforms generated at low and high rotating speeds are 1 and 4

respectively.For 12 rotating magnets

only one voltage waveform generates at any speed.These results demonstrate that the NRMs have great influence on energy generation and output powers of piezoelectric energy harvesters.

关键词

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references

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