Wireless Power Coil-Core Layout for Low Leakage Coupling
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Solution Overview
Problem
Existing wireless power transfer systems face challenges in preventing the deterioration of the coupling coefficient between power transmitter and receiver coils, leading to increased physical sizes and leakage magnetic fields, which affect the ambient environment.
Innovation Solution
A wireless power transfer system is designed with a pair of coils arranged side by side in a horizontal direction, each coil wound in a circular shape with opposing magnetic fields, and integrated with cores that have axisymmetric core slots to balance magnetic fields and reduce leakage, with lead wires routed through these slots to prevent saturation and imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the physical size of the power transmitter coil and power receiver coil is reduced, then the device becomes more compact and easier to deploy, but the leakage magnetic field increases and the coupling coefficient deteriorates
Solution Approach 1:
The core is divided into two separate core portions (first core portion and second core portion) positioned on opposite sides of the coil. Each core portion independently confines the magnetic field generated by the coil, preventing magnetic field leakage while maintaining a compact overall structure. This segmentation allows the coil to maintain small physical dimensions without sacrificing magnetic field confinement effectiveness.
2Reliability
If the coupling coefficient between power transmitter coil and power receiver coil is maintained, then efficient power transfer is achieved, but the physical size of the coils increases
Solution Approach 1:
The magnetic field confinement structure provides enhanced magnetic permeability specifically in the regions where magnetic field lines need to be directed toward the receiver coil. The core portions are strategically positioned to concentrate and guide magnetic flux locally, ensuring strong coupling between transmitter and receiver coils while keeping the overall coil structure compact and maintaining reliable power transfer efficiency.
3Object-generated harmful factors
If the leakage magnetic field is reduced, then the ambient environment is protected from magnetic interference, but the device complexity increases
Solution Approach 1:
The magnetic field confinement function is integrated directly into the coil assembly by combining the coil with core portions that are positioned on opposite sides. This merged structure achieves magnetic field confinement without requiring separate external shielding components, thereby reducing leakage magnetic field while avoiding excessive device complexity. The core portions are seamlessly integrated with the coil structure, creating a unified compact assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively reduces the physical size of the coils and minimizes leakage magnetic fields, maintaining efficient power transfer while preventing coil saturation and imbalance.
Implementation Method 1
a core unit, the core unit being a pair of cores each configured to induce a magnetic field generated by each of the coils in the coil unit
Implementation Method 2
each of the coils in the coil unit has a shape formed by being wound in a horizontal plane and the coils are configured in such a way that magnetic fields generated by currents are oriented oppositely to each other
Data Source
AI summary
A wireless power transfer system is configured in such a way that: a power transmitter coil and a power receiver coil each include a coil unit, the coil unit being a pair of coils arranged side by side in a horizontal direction, and a core unit, the core unit being a pair of cores each configured to induce a magnetic field generated by each of the coils; each core of the core unit is integrated with each coil and the cores are arranged spaced apart from each other; and each core of the core unit is provided with a core slot that divides the core at a position where the core slot configures the core to be substantially axisymmetric about a centerline that is at the same distance from each coil of the pair of coils as an axis of symmetry.