旋转激励磁铁数对压电俘能器输出性能的影响

发布时间：2018-02-12 00:48

本文关键词： 压电俘能器旋转激励磁铁间距输出电压　出处：《光学精密工程》2014年07期 　论文类型：期刊论文

【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29.4,87.2,28.4V和1 282.5,707.5,2451r·min-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]:Considering that the existing rotary generator can not adapt to the high / uniform rotational motion, the vibration shock / noise is high and the reliability is low, a piezoelectric energy capture driven by rotating magnet is proposed. The effects of the number of rotating magnets (spacing) on the excitation force and the characteristics of piezoelectric oscillator are studied theoretically and experimentally. There exists an optimum gap ratio of rotating magnets (the ratio of the diameter of the magnet to the distance between the adjacent magnets and the gap ratio of 2:00) is 6.2 times that of the gap ratios of 0 and 4:00. In the characteristic curve of voltage-rotational speed, there are many optimal rotational speeds which make the output voltage peak. The maximum peak voltage and its corresponding optimum rotational speed are 29.4V 87.2N 28.4V and 1 282.5N 707.5N 2451r 路min-1, respectively. The maximum output voltage of 12 rotating magnets is three times that of the other two cases. The electric energy (waveform number and amplitude) generated by the single excitation of piezoelectric vibrator is also related to the number and speed of rotating magnets. Two rotating magnets can only excite one large amplitude voltage waveform at low rotational speed. At high rotational speed, 4 free oscillation waveforms with larger amplitude can be generated, and only one voltage waveform can be excited by 12 magnets at any rotational speed. The experimental results show that the number of moving magnets is the key factor affecting the power generation and output power of rotary piezoelectric energy capture devices.
【作者单位】：浙江师范大学精密机械研究所;
【基金】：国家自然科学基金资助项目(No.51277166,No.51377147,No.51075371) 浙江省新苗人才计划资助项目(No.2013R404066,No.2013R404071)
【分类号】：TM619

【参考文献】