Development of self-powered wireless sensor system for automobile using magnetostrictive micro vibrational power generator

采用铁基磁致伸缩材料Fe-Ga合金，研制出具有大的逆磁致伸缩效应、良好的加工性和高延展性的新型振动电源。该发电机采用平行梁结构，由绕有线圈的铁镓平板和带有偏置磁铁的磁轭组成。在本研究项目中，我们建立了实际应用的装置配置，并通过小尺寸样机验证了其高发电量为10 mW、高能量转换效率为30%、高延展性。此外，还研制了大型瓦级发电装置，以验证其规模效应。为了加宽频带，研究了升频变频器和多谐振机构。制造了由该设备供电的无线传感器系统和遥控器，以验证其无电池运行。

We invents novel vibrational power generator using Fe-Ga alloy, iron-based magnetostrictive material, with large inverse magnetostrictive effect, good machinability and high ductility. The generator is based on parallel beam structure consisting of Fe-Ga plate wound with coil and yoke accompanied with bias magnet. In this research project, we established device configuration for practical applications and verified its high power generation of 10 mW, high energy conversion efficiency of 30 %, and high ductility by prototype of small size. In addition, large size device of watt order power generation was developed to verify its scale effect. Frequency-up converter and multi resonant mechanism was investigated to widen frequency bandwidth. The wireless sensor system and remote controller powered by the device were fabricated to verify their battery free operation.