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Coupling coefficient calculation and optimization of positive rectangular series coils in wireless power transfer
Yang Leng1,2, Derong Luo1, Zhongqi Li1
1College of Electrical and Information Engineering, Hunan University, Changsha, 410006, China.
Heliyon
|November 2, 2023
Summary
This study introduces a novel rectangular coil structure for wireless power transfer (WPT) systems. It demonstrates that maintaining stable coupling, efficiency, and power is possible even with significant coil misalignment.
Area of Science:
- Electrical Engineering
- Electromagnetics
- Wireless Power Transfer
Background:
- Wireless power transfer (WPT) systems using magnetic coupling resonance are susceptible to performance degradation due to coil misalignment.
- Fluctuations in coupling coefficient, output power, and transmission efficiency impact system stability.
- The coupling coefficient is highly sensitive to geometric parameters and spatial positioning of coils.
Purpose of the Study:
- To propose a stable single-emitter two-receiver rectangular coil structure for magnetic resonance WPT.
- To develop a method for calculating and optimizing coil structures to maintain stable performance under misalignment.
- To validate the proposed coupling coefficient calculation and optimization method through simulation and experimentation.
Main Methods:
- Design of a single-emitter two-receiver positive-series rectangular coil configuration.
- Development of a calculation method for the coil structure and mutual inductance.
- Application of an optimization method to determine structural parameters for stable performance.
- Verification of the coupling coefficient formula via simulations and experimental tests.
Main Results:
- A novel rectangular coil structure and calculation method were proposed and validated.
- The optimization method identified structural parameters ensuring stable WPT performance.
- Experimental and simulation results confirmed the effectiveness of the proposed approach.
- Key finding: Coupling coefficient, transmission efficiency, and output power remained stable even with significant coil offset (Y-axis: half transmitting coil length; X-axis: 10 cm).
Conclusions:
- The proposed coil structure and optimization method effectively address the stability issues caused by misalignment in WPT systems.
- This research provides a pathway to achieve robust and reliable wireless power transfer under non-ideal conditions.
- The findings are crucial for the practical implementation of stable magnetic coupling resonance WPT systems.
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