A Small Magnetic Pre-Stress Based Piezoelectric Diaphragm Generator Induced By Hyperbaric Air
A Small Magnetic Pre-Stress Based Piezoelectric Diaphragm Generator Induced By Hyperbaric Air
复制标题
高压空气诱导的小型磁预应力压电隔膜发生器
DOI：
10.1109/access.2018.2817265
复制
发表时间：
2018-01-01
期刊：
影响因子：
3.9
通讯作者：
Liu, Ming
中科院分区：
文献类型：
--
作者：
Cheng, Tinghai;Liu, Wenbo;Liu, Ming
磁性压电发电机在许多领域都有研究。采用磁铁作为助力装置，可以提高压电发电机的性能。本文提出了一种利用高压空气作用于压电圆膜片时产生的微小磁力来调节压电圆膜片机电转换效率的新方法，即在压电圆膜片中心施加微小磁力产生的预应力，通过改变压电圆膜片的位移来调节压电圆膜片表面电荷分布。理论分析和仿真研究表明，斥力使输出功率增大，引力使输出功率减小。实验结果表明，在0.6 $\text{M}\Omega $电阻上的最大输出电压和峰值功率分别为72.8 V和2.02 mW。发电机的最大峰值功率提高了13.5%，而磁致预应力仅为高压空气负荷的0.6%左右。因此，磁致预应力技术是提高这类压电发电机效率和发电功率的有效方法。
The piezoelectric generator with magnetic has been researched in many different fields. The magnetic is used as power assisting device which can promoted the performance of the piezoelectric generator. This paper presents a novel method that using the small magnetic force to adjust the electromechanical conversion efficiency of piezoelectric circular diaphragm when the hyperbaric air acts on it. The small magnetic force induced pre-stress acted on the center of the piezoelectric circular diaphragm can adjust the surface charge distribution by changing the displacement of the diaphragm. The theoretical analysis and simulated research show that the repulsive force increases the output power, while the attractive force decreases the output power. The experiment results show that the maximum output voltage and peak power across the 0.6 $\text{M}\Omega $ resistors are 72.8 V and 2.02 mW, respectively. The maximum peak power of the generator is promoted 13.5%, while the magnetic induced pre-stress is only about 0.6% of the hyperbaric air load. Therefore, the magnetic induced pre-stressing technique is an effective method to improve the efficiency and generated power in this type of piezoelectric generator.