球形永磁阵列振动能量收集器设计与优化

为实现多方向环境能量收集，设计球形电磁式振动能量采集器。基于二维Halbach阵列设计的球面Halbach永磁阵列，较传统永磁阵列能提高线圈中磁链变化梯度，从而提高结构输出性能；建立数学解析模型，据解析结果对模型各参数进行优化；对该模型进行有限元仿真分析及实验性能测试。结果表明，该模型能有效响应空间任意方向振动，进而转化为电能；外部激励为10 Hz、激励为水平方向、负载阻值50 Ω时，该球形振动能量采集器输出电能达最大，单个线圈中最大负载功率可达0.8 mW。

Design and optimization of spherical magnet array structure of energy harvesting system

 A spherical electromagnet vibration energy harvester is designed to harvest multi-directional vibration energy. Based on 2D Halbach array model, a novel sphere Halbach array is designed, which increases the magnetic field gradient in the coil compared to the traditional permanent magnet array, so as to increase the output performance. Parameter optimization of the spherical structure is carried out according to the analytic results of the corresponding mathematical model. Finite element simulation analysis and experimental performance test are carried out of this model. Experiment results show that the new structure can respond to vibration from any direction, and then transfer to electricity. When the external excitation frequency is 10 Hz, the direction of excitation is horizontal and the load resistance is 50 Ω, the electricity output of this spherical vibration energy harvester reaches maximum. The maximum load power of single coil is 0.8 mW.