Study On The Characteristics Of Cantilever Fe-Ga Alloy Vibration Power Generation System

With the rapid development and wide application of production and life information and intelligence,electronic technology and mechatronic products,low-power electronic devices such as distributed sensors,biochips and portable wireless communication systems have been in precision and ultra-precision processing,MEMS manufacturing.High-tech fields such as laser guidance and biomedical play an important role.However,the energy supply has become one of the problems which affecting and restricting the popularization and development of low-power electronic devices such as wireless sensors.How to provide electric energy for such electronic devices without battery is an urgent problem to improve its comprehensive performance and quality.Vibration energy harvesting technology has been a subject of increasing interest in the past few years.And it may be a new way to overcome unsatisfactory battery problems in low power electronic devices such as wireless sensors.Different machine power conversion methods have been developed based on different functional materials,such as piezoelectric and magnetostrictive methods.Compared to piezoelectric materials and traditional Terfenal-D alloys,Fe-Ga alloys have excellent performance and can survive harsh environmental vibrations,including excellent robustness,higher energy conversion efficiency and greater flexibility.In this paper,based on the inverse effect characteristics of giant magnetostrictive materials,Fe-Ga alloy slice are used as conversion components.The bias magnetic circuit is optimized by ansys finite element analysis,and the inherent size of Fe-Ga alloy slice is analyzed.Based on the influence of frequency and end point deflection,the parameters of the induction current pick-up coil were designed.Finally,the designing for the structural of the magnetostrictive vibration power generation system with flaky Fe-Ga as the core component was completed,and a prototype of the vibration power generation device was developed.Based on the Jiles-Atherton magnetization model,an electromechanical coupling mathematical model of inertial excitation vibration power generation is established,as the same time,The experimental platform of cantilever Fe-Ga alloy vibration power generation system is built.The power generation model of the device under inertial excitation conditions is used to verify the established electromechanical coupling mathematical model.The experimental results are in good agreement with the simulation results.Therefore,the established electromechanical coupling mathematical model can predict the generated power by the system.Under the condition of inertial excitation,the effects of acceleration,vibration frequency and applied load resistance on power generation performance are investigated.what’s more,when the bias magnetic field is 182 mA,the peak-to-peak voltage can reach 763 mV at 69 Hz excitation frequency,and the increase of load impedance will reduce the output power of the system.The visible system is suitable for low load impedance circuits.Under the condition of transient excitation,the power generation density of Fe-Ga alloy is obviously better than other materials,but the electromechanical conversion efficiency of this system is low.In the future research work,the vibration power generation device still needs to be optimized.The research results have a driving significance for the further research and application of giant magnetostrictive vibration power generation devices.