BU-06 Beyond 1-watt energy harvester based on beam vibration and electromagnetic induction
Creators: Hanae Kijima-Aoki
Publisher: name: IEEE
Year: 2025

Following the trend toward automating maintenance with sensor device networks for aging infrastructures, developing a stand-alone environmental power source to replace batteries and commercial power sources is urgent. Although a 1-3W power supply needs multi-functional sensors that satisfy human inspection criteria, the output level of environmental power generation is in the order of 100 mW, excluding solar power generation. Vibration power generation, which converts unwanted environmental vibrations into electric power, is expected to be adapted to different environments from solar power generation. This study aims to achieve more than a 1-watt outcome by developing an electromagnetic induction vibration power generator using beam resonance. The electromagnetic vibrating power generator consists of the soft magnetic core plate (50-layered MaDC-A®, PROTERIAL) inserted in 1000 turn-coil (90 ohms), which is attached to a free end of the non-magnetic cantilever beam. A pair of permanent magnets were fixed with back yoke or non-magnetic fixture (hereafter “without BY”) . The vibration test was performed under 10-30 Hz with accelerations of 1G. From the time-dependent V and P (Fig.2), the beam resonated at 14Hz with an amplitude of free end position of 20 mm. To our knowledge, the Vp-p and Vrms of both devices are the highest value for magnetic vibrating power generators. The peaks are decreased and broadened in the case of the device without BY. The V was maximized when the resonated beam passed across the inverse polar of two permanent magnets with maximum speed. The role of BY is to control the magnetic flux distribution to prevent the soft magnetic core from sticking with permanent magnets. Since the order of power generation is more than 2 W, our electromagnetic vibrating power generator is expected to meet the requirements as an environmental power supply for multi-functional sensor devices.
Following the trend toward automating maintenance with sensor device networks for aging infrastructures, developing a stand-alone environmental power source to replace batteries and commercial power sources is urgent. Although a 1-3W power supply needs multi-functional sensors that satisfy human inspection criteria, the output level of environmental power generation is in the order of 100 mW, excluding solar power generation. Vibration power generation, which converts unwanted environmental vibrations into electric power, is expected to be adapted to different environments from solar power generation. This study aims to achieve more than a 1-watt outcome by developing an electromagnetic induction vibration power generator using beam resonance. The electromagnetic vibrating power generator consists of the soft magnetic core plate (50-layered MaDC-A®, PROTERIAL) inserted in 1000 turn-coil (90 ohms), which is attached to a free end of the non-magnetic cantilever beam. A pair of permanent magnets were fixed with back yoke or non-magnetic fixture (hereafter “without BY”) . The vibration test was performed under 10-30 Hz with accelerations of 1G. From the time-dependent V and P (Fig.2), the beam resonated at 14Hz with an amplitude of free end position of 20 mm. To our knowledge, the Vp-p and Vrms of both devices are the highest value for magnetic vibrating power generators. The peaks are decreased and broadened in the case of the device without BY. The V was maximized when the resonated beam passed across the inverse polar of two permanent magnets with maximum speed. The role of BY is to control the magnetic flux distribution to prevent the soft magnetic core from sticking with permanent magnets. Since the order of power generation is more than 2 W, our electromagnetic vibrating power generator is expected to meet the requirements as an environmental power supply for multi-functional sensor devices.