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Related Experiment Video

Updated: Jun 18, 2026

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion
08:55

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion

Published on: February 5, 2020

Body motion for powering biomedical devices.

Edwar Romero1, Robert O Warrington, Michael R Neuman

  • 1Mechanical Engineering Department, Michigan Technological University, Houghton, MI 49931, USA. eromero@suagm.edu

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|December 8, 2009
PubMed
Summary

This study presents an axial flux generator that harvests kinetic energy from body motion to power miniature biomedical devices. A small prototype generated 3.9 microwatts of power during walking, demonstrating potential for self-powered electronics.

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Area of Science:

  • Biomedical Engineering
  • Energy Harvesting
  • Mechanical Engineering

Background:

  • Kinetic energy harvesting is crucial for powering portable electronics, especially for biomedical applications.
  • Body motion can be harnessed to generate power for small devices, extending battery life or enabling self-powered operation.
  • Existing methods often face limitations in efficiency and form factor for wearable applications.

Purpose of the Study:

  • To present an axial flux generator for harvesting kinetic energy from human activities.
  • To demonstrate the feasibility of powering miniature biomedical devices using body motion.
  • To optimize the design for compact size and efficient power generation.

Main Methods:

  • An axial flux generator design featuring a gear-shaped planar coil and a multipole NdFeB permanent magnet ring with an eccentric weight was developed.
  • Energy generation mechanism relies on electromagnetic induction caused by changing magnetic flux during generator oscillations from body motion.
  • A 1.5 cm³ prototype was constructed and tested.

Main Results:

  • The prototype generator produced 3.9 microwatts of power during walking when placed laterally on the ankle.
  • The device effectively converts kinetic energy from human motion into electrical energy.
  • The compact size (1.5 cm³) is suitable for integration into wearable biomedical devices.

Conclusions:

  • The presented axial flux generator is a viable solution for harvesting kinetic energy from human motion.
  • This technology holds promise for self-powered miniature biomedical devices, reducing reliance on batteries.
  • Further research can optimize the design for higher power output and broader applications in wearable technology.