提高振动发电机充电效率实验研究

The Experiment Study of Enhancing Charging Efficiency of Cantilever Vibration Generator

为提高压电单晶悬臂梁振动发电机充电效率,建立集能量捕获存储于一体的振动发电储能系统,测试了同一规格陶瓷片贴于梁不同位置发电机的发电与充电性能,试验发现:在一阶与二阶振动模态下,各存在一个最佳粘贴位置可使发电机充电效率得到显著提高。在一阶模态下,陶瓷片贴于悬臂梁根部时,发电机充电时间最短;对于二阶模态,陶瓷片贴于梁中间位置的发电机充电最快,并可使电池获得更高的电压。在不同模态下,提高发电机充电效率的一个有效方法是改善陶瓷片贴片位置。

In order to enhance the charging efficiency of piezoelectric monomorph cantilever vibration generator,vibration generation and storage system is built,and when the piezoelectric ceramics patch is located different position of the cantilever,vibration generation and charging efficiency are investigated for such different generator.Experiment results show that there do respectively exist the most appropriate location of the ceramics for the strongest charging capability under first and second vibration modes.The charging time is the shortest for cantilever generator of which the piezoelectric ceramics located at the root of beam under first mode.When ceramics patch locates at the middle of cantilever under second mode,the charging is most effective,moreover the generator enables the battery voltage up to higher value.Therefore,one promising way to improve the charging efficiency of cantilever vibration generator is that the location of the piezoelectric patch should be selected according to the vibration mode.