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<p>The advancement of wearable devices continues to face the challenge of ensuring a sustainable power supply. Traditional human motion energy harvesters often suffer from low energy harvesting efficiency due to their reliance on a single energy source. This study presents a novel pendulum inertial electromagnetic energy harvester (PI-EEH) to harvest multiple-source low-frequency human motion energy. The PI-EEH can simultaneously harvest both the leg swing energy and the foot impact energy during walking. A horizontal universal pendulum, combined with a frequency-up conversion mechanism, transforms irregular human motion into unidirectional high-frequency rotation. The output performance of the PI-EEH is evaluated through both theoretical analysis and experimental testing. A treadmill test is also conducted across various motion speeds to illustrate the benefits of PI-EEH. The peak power of PI-EEH can reach 54 mW at a speed of 3 km/h. Additionally, the PI-EEH can easily supply power for some wearable devices, like a GPS module and an acceleration sensor. The designed PI-EEH offers a viable approach to harvesting energy from multiple-source human motion, which will have broad prospects in smart healthcare and IoT applications.</p>

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A pendulum inertial electromagnetic energy harvester for harvesting multiple-source low-frequency human motion energy

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Zhenghao Wang,
  • Lin Hou,
  • Minghui Yao,
  • Tianzhi Yang

摘要

The advancement of wearable devices continues to face the challenge of ensuring a sustainable power supply. Traditional human motion energy harvesters often suffer from low energy harvesting efficiency due to their reliance on a single energy source. This study presents a novel pendulum inertial electromagnetic energy harvester (PI-EEH) to harvest multiple-source low-frequency human motion energy. The PI-EEH can simultaneously harvest both the leg swing energy and the foot impact energy during walking. A horizontal universal pendulum, combined with a frequency-up conversion mechanism, transforms irregular human motion into unidirectional high-frequency rotation. The output performance of the PI-EEH is evaluated through both theoretical analysis and experimental testing. A treadmill test is also conducted across various motion speeds to illustrate the benefits of PI-EEH. The peak power of PI-EEH can reach 54 mW at a speed of 3 km/h. Additionally, the PI-EEH can easily supply power for some wearable devices, like a GPS module and an acceleration sensor. The designed PI-EEH offers a viable approach to harvesting energy from multiple-source human motion, which will have broad prospects in smart healthcare and IoT applications.