柔性压电发电机的发电性能分析

Power Performance Analysis of Flexible Piezoelectric Generator

为提高微小型压电发电机的发电性能,设计了一种悬臂梁式的柔性风力发电机,通过实验与理论相结合的方法,分析了柔性悬臂梁振子的结构类型和结构尺寸对发电机输出电压的影响规律.研究发现,合理选择压电振子的长、宽以及基底厚度,使压电振子在给定风速下产生共振将有助于提高发电机的发电能力.在0~50m/s的风速范围内,对不同结构尺寸的柔性压电发电机的发电能力进行了测试,实验结果表明：在压电振子能够发生共振的前提下,基底的厚度对发电性能的影响不大,而振子的长度及宽度对压电发电机的输出电压影响较大,且输出电压不随振子尺寸单调递增;在其他参数均为定值的前提下,压电振子的最优长度为40mm,最优宽度为11.3mm.

In order to improve the performance of micro piezoelectric generator, a design of flexible cantilever-beam piezoelectric generator was proposed. The influence of the beam＇s shapes and parameters on the output voltage of the piezoelectric generator, through theory and experiments was studied. Therefore a generator with appropriate structure parameters, such as length, width and substrate thickness will resonate easily on given wind speed, which helps to improve the power capacity of generator. Within a given wind speed range of 0 to 50 m/s, the power generating capacity of the flexible piezoelectric generator with different dimensions was researched. The experimental results imply that, the thickness of the substrate almost doesn＇t affect the power performance with resonance, but the length and width of generator has a greater influence on the output voltage, and the output voltage is not monotone increasing with the length and the width. The optimum length of piezoelectric generator is 40 ram, and the width is 11.3 mm.