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Single-Sided Near-Field Wireless Power Transfer by A Three-Dimensional Coil Array
Amirhossein Hajiaghajani1, Seungyoung Ahn2
1Department of Electrical Engineering and Computer Science, University of California, Irvine, CA 92697, USA. ahajiagh@uci.edu.
Micromachines
|March 24, 2019
Summary
This study introduces a novel 3D electromagnet design inspired by Halbach arrays to improve wireless power transfer for medical microrobots. The new design enhances magnetic field intensity on the target side while minimizing power leakage, improving MRI quality.
Area of Science:
- Biomedical Engineering
- Electromagnetics
- Medical Imaging
Background:
- Wireless power transfer is crucial for medical microrobots, but transmitter coils can degrade MRI signal-to-noise ratio.
- Controlled single-sided transmitters are needed to enhance imaging and reduce radiation leakage.
Purpose of the Study:
- To develop a novel electromagnet for wireless power transfer that enhances magnetic field intensity on the target side.
- To suppress magnetic field leakage to the back lobes for improved MRI quality.
- To miniaturize the wireless power transmitter system.
Main Methods:
- A three-dimensional (3D) coil scheme inspired by generalized Halbach arrays was used to replace traditional circular coils.
- The electromagnet design automatically cancels magnetic field back lobes.
- A wireless charging pad was fabricated using 3D-assembled printed circuit boards.
Main Results:
- The new design significantly reduces power transfer to the back lobe (15-fold less than the main lobe).
- Powering efficiency remains comparable to conventional planar coils.
- The 3D structure eliminates the need for traditional magnetic shielding materials.
Conclusions:
- The proposed 3D electromagnet array offers improved magnetic field control for wireless power transfer in medical applications.
- This technology enhances MRI quality by suppressing radiation leakage.
- The miniaturized system and integrated design pave the way for more efficient and effective medical microrobot systems.
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