Design Optimization and Comparison of Cylindrical Electromagnetic Vibration Energy Harvesters

Area of Science:

• Mechanical Engineering
• Electrical Engineering
• Materials Science

Background:

• Electromagnetic vibration energy harvesting is crucial for powering autonomous devices.
• The coil-magnet structure significantly impacts harvester performance and design.
• Optimizing harvester configurations is essential for maximizing energy output.

Purpose of the Study:

• To investigate and compare the performance of four distinct electromagnetic vibration energy harvester designs.
• To identify the optimal coil-magnet configuration for maximum output power and power density.
• To evaluate the suitability of the electromagnetic coupling coefficient for harvester optimization.

Main Methods:

• Utilized a Python-based automatic optimization procedure.
• Performed simulations using ANSYS Maxwell and MATLAB Simulink.
• Analyzed four cylindrical electromagnetic vibration energy harvester configurations within a fixed volume.

Main Results:

• The two-opposing-magnet harvester demonstrated the highest output power and volume power density.
• The Halbach array with three magnets and one coil achieved the highest mass power density.
• The three-magnet Halbach array was identified as the best among Halbach array configurations.

Conclusions:

• The two-opposing-magnet design is superior for overall output power and volumetric efficiency.
• Specific configurations offer advantages in mass power density, highlighting trade-offs in design.
• Relying solely on electromagnetic coupling coefficient can be misleading for output power maximization.