Study On Pre-magnetization Conditions Of Cantilever Fe-Ga Alloy Vibration Collector

With the rapid development of electronic technology and radio communications,distributed sensors,micro processors,smart chips and other low-power micro devices have better prospects for development,but the problem of power supply is restricting the application and One of the problems of subsequent development.At present,micro devices often use traditional batteries for power supply,and traditional chemical batteries have caused certain pollution to the environment and limited energy storage.Because environmental vibration is widespread in nature and the highest efficiency of environmental vibration energy conversion,it is particularly important to collect the vibration in the environment and convert it into electrical energy.In this paper,a magnetostrictive material is used as the core element to design and manufacture a vibration energy collection device,and the device is deeply studied under different pre-magnetization optimization conditions such as different permanent magnet layout,size,NS pole orientation,etc.The study found that pre-magnetization optimization has an important effect on energy harvesting,and finally analyzed the output characteristics of the vibration energy harvesting device under the optimal pre-magnetization optimization conditions.This article first introduces the current research status of vibration energy collectors at home and abroad,and compares the advantages of magnetostrictive vibration energy collectors compared to other vibration energy collectors.Fe-Ga alloy has the advantages of high mechanical strength,suitable for complex mechanical mechanisms,Finally,the flake-shaped Fe-Ga alloy is used as the energy conversion core element of the vibration collection device.Based on the constitutive relationship of magnetostrictive materials,the performance characteristics of Fe-Ga alloy are studied from a microscopic perspective,and the electromechanical conversion principle of magnetostrictive vibration energy harvesting device is studied.In addition,the pre-magnetizing magnetic field supply method and the prototype structure were designed.Three different pre-magnetizing field layouts and five different permanent magnet specifications and sizes were proposed.Under each different pre-magnetizing field layout,use ANSYS simulation software simulates and analyzes the magnetic field strength and magnetic induction line distribution on the Fe-Ga alloy sheet,and finds that the size and distribution of the magnetic field strength are different in different arrangements.Considering the uneven distribution of magnetic field strength,a mathematical expression was constructed to explain the problem of magnetoelectric conversion.And through the experiment,the output characteristics of the cantilever vibration energy harvesting device under different pre-magnetization fields are analyzed in detail,and finally the better pre-magnetization conditions are determined.Finally,under better pre-magnetization conditions,the output characteristics of the Fe-Ga alloy cantilever collector were systematically measured experimentally.The experimental results show that under the best pre-magnetization conditions,when the 6g acceleration and 90 Hz are measured,the maximum output voltage is 910 mv,and the maximum power output to the external load is 3.94 mW.And try to apply the device in practice,the results show that the vibration energy device can continuously light up multiple LED light-emitting diodes and USB physical lights after the signal processing of the quadruple voltage rectifier circuit,the result verifies the sustainability of the device Power generation performance.