Inclined Road Coil Layout for Obstacle-Resistant Wireless Power Transfer
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Solution Overview
Problem
In wireless power transfer systems, obstacles such as small animals or metal objects can interfere between the power transmission and reception devices, leading to eddy currents, reduced efficiency, and potential fires, necessitating improvements in power transfer technology.
Innovation Solution
The power transmission device is installed in a road with its coil plane inclined relative to the road surface, and the power reception device is housed within a vehicle's wheel, with both coils' normal lines angled to minimize interference and maximize efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power transmission device and power reception device are positioned far apart, then the installation flexibility is improved, but obstacles may enter the space between them causing eddy currents and reducing power transfer efficiency
Solution Approach 1:
The patent changes the spatial arrangement from a vertical configuration (coils parallel to road surface) to an inclined configuration (coils at an angle to road surface). This dimensional change in coil orientation creates a more compact effective transfer area while maintaining installation flexibility, preventing obstacles from entering the magnetic field space between transmission and reception coils.
2Adaptability or versatility
If the power transmission device and power reception device are positioned far apart, then the installation flexibility is improved, but obstacles may enter the space between them causing heating and fire hazards
Solution Approach 1:
By inclining the coils at a specific angle relative to the road surface rather than positioning them parallel, the patent reduces the vertical space between transmission and reception coils. This dimensional adjustment minimizes the gap where obstacles could be trapped and heated by eddy currents, thereby reducing fire hazards while preserving installation adaptability.
3Device complexity
If the coil normal line is perpendicular to the road surface, then the magnetic field alignment is simplified, but obstacles can easily enter the space between transmission and reception coils
Solution Approach 1:
The patent introduces asymmetry by inclining the coil planes at a specific angle (e.g., 45 degrees) relative to the road surface rather than maintaining symmetric perpendicular alignment. This asymmetric configuration reduces the vulnerable space where obstacles can enter while still achieving effective magnetic coupling between transmission and reception coils, improving reliability without excessive complexity.
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 reduces the likelihood of obstacles entering the transmission-reception gap, enhancing power transfer efficiency and safety by stabilizing the power supply to the vehicle.
Implementation Method 1
a power transmission device installed in a road and provided with a power transmission coil that transmits power wirelessly
Implementation Method 2
a power reception device provided with a power reception coil that receives power wirelessly
Implementation Method 3
an obstacle such as a small animal or piece of metal may come into the space between the power transmission device and the power reception device, eddy currents may be generated around the obstacle
Data Source
AI summary
A wireless power transfer system 1 includes a power transmission device 2 and a power reception device 3. The power transmission device 2 is a power transmission device 2 installed in a road 4, is provided with a power transmission coil 21 that transmits power wirelessly, and is configured such that when installed in the road 4, the normal line of a coil plane of the power transmission coil 21 is inclined with respect to the normal line of the road surface of the road 4 in a lateral cross section of the road 4. The power reception device 3 is provided with a power reception coil 31 that receives power wirelessly, and at least a portion of the power reception coil 31 is housed in the wheel 6 of the moving body 5.