Related Experiment Video
Updated: Jul 10, 2025

Autonomous and Rechargeable Microneurostimulator Endoscopically Implantable into the Submucosa
Published on: September 27, 2018
Wireless power transfer system for capsule robot designed by radial square transmitting coil pair with novel ferrite
Renqing Wen1,2, Guozheng Yan1,2, Zhiwu Wang2,3
1School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China.
Background:
Wireless power transmission for capsule robots has always posed challenges due to the unpredictable postures.
Methods:
A radial transmitting coil with a novel ferrite structure is proposed, which consists of two parts with the function of converging magnetic induction lines and reducing magnetic leakage. To improve the flux density, uniformity, and shielding effectiveness, the design parameters are discussed and optimized on the basis of analytical calculations and simulation analysis.
Results:
The proposed ferrite structure improves the power transfer efficiency from 2.78% to 5.21%. Additionally, the power transfer stability showed a slight improvement from 76.4% to 77.6%, while magnetic leakage was reduced by 84%. Finally, the human tissue safety is also discussed and verified.
Conclusions:
The wireless power transfer system is shown to be feasible and safe.
More Related Videos
Related Concept Videos
Energy Stored In A Coaxial Cable
In the simplest form, a coaxial cable can be represented by two long hollow concentric cylinders in which the current flows in opposite directions. The magnetic field inside and outside the coaxial cable is determined by using Ampère's law. The magnetic...
Magnetic Field Due to Two Straight Wires
Maximum Power Transfer
By substituting the entire circuit with...
Magnetic Field Due To A Thin Straight Wire
Torque On A Current Loop In A Magnetic Field
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
Generating Electromagnetic Radiations

