Optimization Design Of Low Frequency Vibration Energy Harvester Based On Permanent Magnet Attraction

Vibration energy is one of the clean energy sources in nature that exist in nature.Vibration energy harvesting technology can convert vibrational energy into electrical energy,and vibration energy harvesters were originally designed to try to power low-power products.With the deepening of research,the vibration energy harvester has gradually become an important research direction in the field of energy harvesting and new energy.Since the vibration energy existing in the environment has basically low-frequency characteristics,it is meaningful to study a low-frequency vibration energy harvester to adapt to the low-frequency characteristics in the natural environment.The paper aims at the optimization design of low frequency vibration energy harvester based on permanent magnet attraction.Firstly,the nonlinear simulation of the proposed nonlinear structure is carried out,and a simulation model of the low-frequency electromagnetic vibration energy harvester is established;The steady-state magnetic field distribution of the pick-up system,the three-dimensional force of the vibrator and the electrical characteristics of the induction coil are simulated and analyzed respectively;Then,the magnetic flux gradient and output power density of the vibration pickup system are optimized by the established vibration platform to obtain optimal parameters of the induction coil;Finally the open circuit voltage is tested,and the rectifier experiment is verification under the experimental.The main work of the paper is as follows:(1)By reviewing relevant literature at home and abroad,the structure of the vibration pickup system is divided into two categories:linear and nonlinear structure.Based on an overview of existing vibration energy harvesters,its structural feature and performance are summarized and analyzed.(2)Based on the existing vibration energy harvesting technology,discuss the mechanical motion principle of linear and nonlinear structures of vibration energy harvesters,analyze the electromagnetic mechanism of the vibration energy harvester,through the existing pick-up system structure model,propose a new structure of low frequency vibration energy harvester.(3)Using finite element simulation software to optimize the linearization of the optimization results,a structural model of a low-frequency rolling vibration energy harvester is optimized by orthogonal experiment;Mechanical simulation analysis and steady-state magnetic field simulation analysis of the vibration pickup system,b ased on the analysis of simulation data,the structural parameters of the collector is designed and the structure design of the collector is completed.(4)A low-frequency rolling vibration energy harvester experimental prototype is developed,and its output performance is tested.The experimental results are:when the frequency is at 10.653 Hz and equals to the resonant frequency of system,the peak to peak of output voltage of the collector is about 22.6V,the power density at the optimum thickness of the induction coil is 0.899 mW/cm~3,and the output energy can effectively and stable drive the LED lamp through chip rectification.