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A Magnetic-Coupled Nonlinear Electromagnetic Generator with Both Wideband and High-Power Performance.

Manjuan Huang1, Yunfei Li2, Xiaowei Feng1

  • 1Jiangsu Provincial Key Laboratory of Advanced Robotics, School of Mechanical and Electric Engineering, Soochow University, Suzhou 215123, China.

Micromachines
|August 27, 2021
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Summary

This study introduces a high-performance nonlinear electromagnetic generator (MNL-EMG) with an iron core, significantly boosting output power and bandwidth. The device effectively powers microelectronic devices and charges batteries, demonstrating its practical potential.

Keywords:
electromagnetic generator (EMG)high performancemagnetic couplingnonlinearvibration energy harvestingwideband

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Area of Science:

  • Energy Harvesting
  • Electromagnetism
  • Materials Science

Background:

  • Vibration energy harvesting is crucial for powering autonomous microelectronic devices.
  • Traditional electromagnetic generators (EMGs) suffer from narrow operating bandwidths and limited power output.
  • Enhancing magnetic coupling is key to improving EMG performance.

Purpose of the Study:

  • To propose and analyze a high-performance magnetic-coupled nonlinear electromagnetic generator (MNL-EMG).
  • To investigate the impact of a high-permeability iron core on generator performance.
  • To optimize the MNL-EMG design for wide bandwidth and high power output.

Main Methods:

  • Incorporation of a high-permeability iron core into the coil of a magnetic-coupled generator.
  • Simulation of magnetic forces and magnetic flux density to optimize MNL-EMG dimensions.
  • Experimental validation of output power, operating bandwidth, and charging capabilities.

Main Results:

  • The MNL-EMG demonstrated a 4.3 times wider operating frequency range (17–30 Hz) compared to linear EMGs.
  • Maximum output power reached 174 mW at 35 Ω load, suitable for microelectronic devices.
  • Successfully powered 360 LEDs and demonstrated efficient battery charging (0.95 V to 0.98 V in 240 s).

Conclusions:

  • The proposed bistable EMG device, utilizing magnetic coupling and an iron core, offers significant advantages in operating bandwidth and output power.
  • The MNL-EMG's performance is sufficient for powering various microelectronic devices.
  • This technology presents a promising solution for self-powered sensor networks and portable electronics.