磁场增强压电悬臂梁震动发电装置

Abstract

在压电悬臂梁的自由端施加非均匀磁力增加梁的振幅, 探索研究了磁力对悬臂梁的谐振频率漂移、输出电压和输出功率的影响。结果表明, 引入非均匀磁场斥力, 压电悬臂梁的输出电压和输出功率得到明显提高。当负载电阻为100 k Ω , 振动台( LDS) 用0. 200 V 正弦电压驱动时, 由尺寸75 mm x 7. 8 mmx 0. 35 mm 的锆钛酸铅镧( PLZT ) 长压电片和80 mm x 7. 8 mm x 0. 10 mm 黄铜片构成的压电悬臂梁在谐振频率的电压和功率输出分别为19. 02 V 和1. 8 mJ。 The swing amplitude of the piezoelectric cantilever can be improved via applying a non-uniform magnetic force on its free end. The effect of the magnetic force on the resonant frequency shift, output voltage and output power of the cantilever has been investigated. The results showed that the output voltage and output power of the cantilever could be improved obviously when a nonlinear magnetic repulsion force was applied. When a 100 k Ω resistor was loaded and the vibrator ( LDS, Ling Dynamic System) was driven by 0. 200 V sine wave voltage, the output voltage and output power of the cantilever , which w as composed of a piece of PLZT ( size of 75 mm x 7. 8 mm x 0. 35 mm) and a piece of brass ( size of 80 mm x 7. 8 mm x 0. 10 mm) , were found to be 19. 02 V and 1. 8 mJ respectively at resonant frequency.