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Research on Structural Optimization and Excitation Control Method Using a Two-Dimensional OWPT System for Capsule
Wenwei Li1, Pingping Jiang1, Zhiwu Wang1
1School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Micromachines
|January 8, 2025
Summary
This study introduces a 2D omnidirectional wireless power transfer (OWPT) system for capsule robots, using a 3D coil structure. It achieves stable power delivery, crucial for advanced medical devices.
Area of Science:
- Engineering
- Biomedical Engineering
- Electrical Engineering
Background:
- Wireless Power Transfer (WPT) is vital for powering capsule robots.
- Existing WPT systems face limitations in directional power delivery.
- Continuous and stable power is essential for capsule robot functionality.
Purpose of the Study:
- To propose a two-dimensional omnidirectional wireless power transfer (OWPT) system.
- To enable effective power transmission in multiple spatial directions for capsule robots.
- To ensure sufficient internal space for diverse patient anatomies.
Main Methods:
- Utilized a 3D transmitting structure with Helmholtz and saddle coils.
- Optimized saddle coil design using magnetic field calculation and finite element analysis.
- Developed a phase difference control method for a 2D rotating magnetic field.
Main Results:
- Achieved a minimum received voltage stability of 94.5% with a 1D transmitting coil.
- Generated a 2D rotating magnetic field at the origin using 3D coils.
- Delivered a minimum received power of 550 mW with a 7.68% voltage fluctuation rate.
Conclusions:
- The proposed 2D OWPT system effectively delivers stable power to capsule robots.
- The 3D coil design and control method enable omnidirectional power transmission.
- This technology supports the advancement of untethered capsule endoscopy and robotics.
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