一种冲击式压电发电机的实验研究

摘要

介绍了自行设计制作的一种冲击式压电发电机.首先通过分析影响压电陶瓷发电量的因素,确定压电陶瓷的尺寸,并给出了冲击弹簧与恢复弹簧的刚度设计要求,然后测量了压电陶瓷叠片的模态及压电发电机的力谱,可以看出其冲击力能激发出压电陶瓷的轴向振动模态,从而使其产生的电荷能最多.最后,对压电发电机的性能进行了测试,得到其瞬时发电功率在0.3W左右,能够点亮210个并联发光二极管.%A piezoelectric generator was designed and manufactured. Firstly, by analyzing effects of related factors on piezoelectric ceramic's power generation, the shape and size of the piezoelectric ceramic were determined. The stiffness requirements of impact spring and recover spring were given. Secondly, the piezoelectric ceramic's modes and the piezoelectric generator's impact response spectrum were measured, it was shown that impact can excite piezoelectric ceramic's axial vibration modes, so the piezoelectric ceramics produce more electric charges. Finally, the generating power of the piezoelectric generator was tested, its instantaneous power could reach 0. 3W and light up 210 LEDs.