基于弹簧振幅放大的电磁式振动发电设计

Design of Electromagnetic Vibration Power Generation Based on Spring Amplitude Amplification

针对新能源振动发电技术,提出了一种利用弹簧增大振幅的电磁式振动能量收集装置。为提高能量收集效率,利用电机电磁模型和质量-弹簧-阻尼振动模型对能量收集装置的输出电压进行了建模分析。针对振动频率为15 Hz、振幅1 mm的样例工况,对弹簧振幅放大机构进行了最优化设计;根据优化结果利用Solid-Works软件对弹簧振幅放大机构进行建模,并将模型导入ANSYS软件进行有限元分析,对振幅放大机构设计方案的合理性与可行性进行评估;最后,制作样机并搭建了振动发电实验平台,对样机进行实验验证。实验结果表明,所设计方案在样例工况下将动子振幅放大7.98倍,空载电压达22.8 V,最大输出功率为0.44 W。为使本装置能够应用于更为广泛的领域,利用3个不同频率工况进一步验证了所设计装置与所提方法的有效性。

For new energy vibration power generation,this paper proposed an electromagnetic vibration energy harvesting device that uses a spring to increase the amplitude.In order to improve the energy harvesting efficiency,this paper used the motor electromagnetic model and the mass-spring-damping vibration model to model and analyze the output voltage of energy harvesting device.For the sample working condition of vibration frequency of 15 Hz and amplitude of 1 mm,the optimal design of the spring amplitude amplification mechanism was carried out.According to the optimization results,Solid-Works software was used to model the spring amplitude amplification mechanism.In addition,the model was imported into ANSYS software for finite element analysis to evaluate the rationality and feasibility of the design scheme of the amplitude amplification mechanism.Finally,a prototype was made and a vibration power generation experimental platform was built to verify the prototype.The experimental results show that the design scheme in this paper amplifies the amplitude of the mover by 7.98 times,the no-load voltage reaches 22.8 V,and the maximum output power is 0.44 W,which better realizes the vibration energy collection.In order to make the device can be applied to a wider range of fields,the effectiveness of the designed device and the proposed method was further verified by using three different frequency working pairs.