（College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 417002, China）
Abstract: The nonlinear electromagnetic energy harvesting device has problems of high natural frequency, narrow working frequency band and low energy harvesting efficiency, so a nonlinear electromagnetic energy harvesting device with double-vortex planar spring structure is designed to solve them. First, finite element simulation is used to analyze the effects of geometric parameters on the double-vortex planar spring to determine the optimal geometric spring structure. Then, the energy harvester model is built and power generation mechanism is analyzed. According to numerical simulation and experimental test results, the double-vortex planar spring can change from linear characteristics to nonlinear characteristics as the excitation increases. When the excitation is 1g, open circuit voltage of the energy harvester reaches about 5 V, the maximum output power is 18 mW, and the working frequency band is about 5 Hz. Compared with other vibration energy harvesters, this one is more suitable for collecting low-frequency vibration energy, and has a better application prospect in the power supply system of wireless sensor networks.
Key words: electromagnetic vibration energy harvesting ; planar spring ; nonlinear ; broadband
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