A Piezo-Electromagnetic Coupling Multi-Directional Vibration Energy Harvester Based on Frequency Up-Conversion...

Area of Science:

• Energy Harvesting
• Materials Science
• Mechanical Engineering

Background:

• Harvesting vibration energy is crucial for powering wearable devices.
• Existing single-mechanism harvesters suffer from low power output, efficiency, and narrow operating ranges.
• Need for advanced harvesters capable of capturing low-frequency motion energy.

Purpose of the Study:

• To propose a new structure for a piezoelectric electromagnetic coupling up-conversion multi-directional vibration energy harvester.
• To enhance energy harvesting capabilities for wearable devices and human motion.
• To overcome limitations of single-mechanism harvesters.

Main Methods:

• Designed a harvester with four piezoelectric electromagnetic coupling cantilever beams arranged circumferentially.
• Integrated piezoelectric plates for energy harvesting and permanent magnets as mass blocks.
• Utilized a rotating mass block with magnets to induce cantilever vibration via magnetic interaction.

Main Results:

• The proposed harvester effectively collects nonlinear impact vibration energy from low-frequency motion.
• The piezoelectric cantilever vibrates at its natural frequency due to magnetic interactions.
• Demonstrated potential for improved power output and broader working frequency bands compared to single-mechanism devices.

Conclusions:

• The novel piezoelectric electromagnetic coupling harvester offers a promising solution for powering wearable devices.
• The multi-directional design and up-conversion mechanism enhance energy harvesting efficiency from human motion.
• This technology addresses the limitations of current vibration energy harvesters.