Design And Optimization Of An Energy Harvester With Spherical Magnet Array

The power supply of micro-electromechanical system and traditional wireless sensor nodes relies on battery currently, which has some disadvantages, such as large volume short life, frequent replacement and so on. New energy harvesting system is an inexorable trend of power supply. The ambient energy has attracted widespread attention because of its widespread existence, large energy density, strong stability, what’s more it’s clean and easy to microminiaturize. However, the ambient energy has attracted widespread attention because of its large energy density, strong stability, also it’s clean and easy to microminiaturize.Firstly, this paper researches and analyzes domestic and foreign development, and notices that most energy harvesters focus on vibration of single direction, which is not consistent of the multiple direction property of ambient vibration. As result, a spherical vibration energy harvester is designed to harvest multiple directional vibration energy by analyzing the symmetrical characteristic of sphere. A spherical Halbach array is designed and theoretical analysis of this magnet circuit is conducted. Parameter optimization is carried out according to the analytical results. The finite element simulation analysis of this model is conducted with Ansoft Maxwell. The simulation results are compared to the analytical results.Due to the limitation of processing technology, a dodecahedron magnet array is designed in this paper, and simulation analysis of this model has been done. A performance testing platform of multiple directional vibration energy harvester is established based on the engineering. Experimental results show that this structure responds to ambient vibration from any direction, and then output electricity. When the external excitation frequency is 10 Hz, the direction of excitation is horizontal and the load resistance is 50Ω, the electricity output of this spherical vibration energy harvester reaches maximum. The maximum load power of single coil is 0.8mW, which proves the adaptation of this spherical vibration energy harvester to multiple directional ambient vibrations. The research of this paper has instructive function for further research of vibration energy harvesting technology.