On the Design of a Thermo-Magnetically Activated Piezoelectric Micro-Energy Generator: Working Principle

Area of Science:

• Materials Science
• Energy Harvesting
• Piezoelectric Devices

Background:

• Piezoelectric generators convert mechanical stress into electrical energy.
• Thermo-magnetic materials exhibit changes in magnetization with temperature.
• Integrating these phenomena offers novel energy harvesting possibilities.

Purpose of the Study:

• To present a new design for a thermo-magnetically activated piezoelectric generator.
• To investigate the generator's behavior using a coupled numerical model.
• To demonstrate tunability for different activation temperatures.

Main Methods:

• Development of a novel thermo-magnetic piezoelectric generator design.
• Implementation of a global coupled numerical model for static and dynamic analysis.
• Simulation of temperature cycles to analyze material magnetization effects.

Main Results:

• The proposed generator design effectively utilizes temperature-dependent magnetization.
• The numerical model accurately predicts the generator's static and dynamic performance.
• Achieved energy densities of 280 µJcm⁻³ (opening) and 67 µJcm⁻³ (closing).

Conclusions:

• The thermo-magnetically activated piezoelectric generator is a viable energy harvesting technology.
• The generator's performance can be tuned by modifying its physical design.
• This technology holds potential for efficient energy generation in varying temperature environments.