压电电磁复合式振动能量采集器模型的研究

针对目前单一化的压电式或电磁式机械振动能量采集装置最大输出功率较低的问题,设计了一种新型的压电电磁复合式能量采集器。通过对复合式能量采集器建立数学模型,推导出了电压、电流及输出功率的表达式。然后对复合式能量采集器的输出功率特性进行数值仿真,并设置压电片内阻值及其他参数条件,对比分析复合式能量采集器模型与单一的压电式或电磁式能量采集器模型,理论上输出功率提高了38.2%和4.74%。最后通过对采用悬臂梁结构的振动能量采集器的具体实验数据进行分析,论证了压电电磁复合式能量采集器输出功率的高效性。

Study on the Model of Hybrid Piezoelectric and Electromagnetic Vibration Energy Harvester

Aiming at the problem of lower maximum output power of the current single piezoelectric or electromagnetic mechanical vibration energy harvesters,a new hybrid piezoelectric and electromagnetic vibration energy harvester was designed in this paper.The mathematical model of hybrid energy harvester was established and the expressions of voltage,current and output power were deduced.Then the numerical simulation of the output power characteristic of the hybrid energy harvester was carried out. Moreover,the piezoelectric plate resistance and other parameters were set.By means of comparison of hybrid energy harvester model with the single piezoelectric or electromagnetic energy harvester model,the theoretical output power increased by 38.2% and 4.74% respectively.Finally,the high efficiency of output power of the hybrid piezoelectric and electromagnetic vibration energy harvester was verified through the analysis of the specific experimental data of the vibration energy harvester with a cantilever beam structure.