Higher output of vibration power generation using inverse magnetostriction effect

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K21088
• Research Category: Grant-in-Aid for Challenging Research (Exploratory)
• Allocation Type: Multi-year Fund
• Review Section: Medium-sized Section 26:Materials engineering and related fields
• Research Institution: Osaka University
• Principal Investigator: Fujieda Shun 大阪大学, 大学院工学研究科, 准教授 (60551893)
• Project Period (FY): 2020-07-30 – 2023-03-31
• Keywords: 磁性・電子・情報材料 / 逆磁歪効果 / 振動発電

Outline of Final Research Achievements

Vibration power generation using the inverse magnetostriction effect is an energy harvesting technology that can generate electrical power from ambient vibration. Though its application to maintenance-free compact power supplies for IoT devices is expected, higher output power is eagerly desired for further expansion of application. In this study, we focused on a grain-oriented electromagnetic steel sheet, which is an Fe-Si alloy polycrystal with controlling crystal orientation, and it was applied to large vibration power generation devices. As a result, it was found that the average power of the unimorph U-shaped device was increased about 131 times when the device size is enlarged by 4 times with the same aspect ratio. Therefore, larger devices are effective in improving power generation characteristics, and grain-oriented electromagnetic steel sheets are expected to be applied to large devices with high output power.

Free Research Field

磁性材料

Academic Significance and Societal Importance of the Research Achievements

カーボンニュートラルの社会的要請が高まり、エナジーハーベスティング技術の重要性が高まっている。本研究により、逆磁歪効果を利用した振動発電の発電電力はデバイスサイズに強く依存することが明らかになった。例えば、小型デバイスを8個用いるより、小型デバイスを等アスペクト比で2倍にした大型デバイスを用いた方が、振動発電用材料の体積は同じであるが、高い出力が得られる。逆磁歪効果を用いた振動発電は、主にIoTデバイス用のメンテナンスフリー電源としての応用が期待されているが、用途拡大を促進する重要な成果を得た。