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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.

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|January 8, 2025
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Summary
This summary is machine-generated.

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.

Keywords:
Helmholtz coilS-S topologycapsule robotsomnidirectional magnetic fieldsaddle coil pairswireless power transfer

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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.