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A Frequency-Adjustable Tuning Fork Electromagnetic Energy Harvester.

Qinghe Wu1, Shiqiao Gao1, Lei Jin1

  • 1State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, China.

Materials (Basel, Switzerland)
|March 25, 2022
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Summary

This study introduces a novel frequency-adjustable tuning fork electromagnetic energy harvester. This device efficiently converts ambient vibrations into electrical power across a wide frequency range, powering devices like LED lamps.

Keywords:
electromagneticenergy harvesterfrequencytuning forkvibration mode

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Area of Science:

  • Energy Harvesting
  • Mechanical Engineering
  • Materials Science

Background:

  • Vibration energy harvesting is crucial for powering autonomous systems.
  • Existing harvesters often have fixed resonant frequencies, limiting their efficiency with variable environmental excitations.
  • Tuning fork-based electromagnetic harvesters offer potential but typically lack frequency adjustability.

Purpose of the Study:

  • To develop a frequency-adjustable tuning fork electromagnetic energy harvester.
  • To enable resonant operation across a broader range of environmental excitation frequencies without structural modification.
  • To enhance power output and power density compared to existing piezoelectric counterparts.

Main Methods:

  • Design and fabrication of a novel tuning fork electromagnetic energy harvester with adjustable frequency.
  • Experimental characterization of the harvester's performance across a range of excitation frequencies (9.2 Hz to 20 Hz).
  • Comparative analysis of output power and power density against a piezoelectric tuning fork energy harvester of similar dimensions.

Main Results:

  • The developed electromagnetic energy harvester successfully adjusted its natural frequency to match environmental excitations.
  • Achieved a tunable operating frequency range from 9.2 Hz to 20 Hz.
  • Demonstrated a peak power output of 23.59 mW at 9.2 Hz, with significant increases in power (+14.85 mW) and power density (+169.88%) compared to piezoelectric harvesters.
  • Successfully powered an LED lamp, validating its practical application.

Conclusions:

  • The frequency-adjustable tuning fork electromagnetic energy harvester offers superior performance and adaptability for variable vibration environments.
  • This technology significantly expands the usable frequency spectrum for vibration energy harvesting.
  • The enhanced power output and efficiency make it a promising solution for powering low-power electronic devices.