Fiber-Reinforced Protection Cover for Embedded Power Feeding Coils
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Solution Overview
Problem
The challenge is to maintain power feeding efficiency and protect facility devices, such as contactless power feeding coils, embedded under concrete pavements without increasing the thickness of the concrete, which is necessary for both vehicle travel and device protection, while minimizing embedding depth for maintenance and inspection purposes.
Innovation Solution
A facility protection cover made of fiber-reinforced cement composite with two legs and a bridging portion is used, which transmits vehicle weight to the concrete foundation and restricts leg movement, preventing tensile strain and ensuring compressive strain to reduce bending deformation and maintain road surface functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the concrete immediately above the power feeding coils is increased to protect the facility device, then the protective function is improved, but the distance between the power feeding coils and the power receiving coil increases, deteriorating power feeding efficiency
Solution Approach 1:
The concrete pavement is segmented into two functional layers: a thick concrete foundation layer that provides structural support and protection for the power feeding coil, and a thin facility protection cover layer that provides minimal protection while maintaining electromagnetic coupling. This segmentation allows each layer to optimize its thickness for its specific function, resolving the contradiction between protection and power feeding efficiency.
Solution Approach 2:
The facility protection cover is designed with non-uniform thickness, being thinner directly above the power feeding coil to maintain magnetic field coupling, and thicker at the edges to provide structural support and protection. This local variation in quality allows the structure to simultaneously achieve both protective function and power feeding efficiency.
2Use of energy by moving object
If the thickness of the concrete immediately above the power feeding coils is reduced to improve power feeding efficiency, then the magnetic field strength is improved, but bending cracks occur in the concrete due to vehicle weight, deteriorating the protective function and road surface functions
Solution Approach 1:
The structure is divided into a load-bearing concrete foundation that handles vehicle weights and a thin protection cover that maintains electromagnetic coupling. The foundation provides the necessary structural strength to prevent bending cracks under vehicle loads, while the thin cover minimizes interference with the magnetic field, thus resolving the contradiction between strength and power feeding efficiency.
Solution Approach 2:
The protective function is shifted from a vertical dimension (thick concrete cover) to a combination of vertical (thin cover) and horizontal dimensions (wide foundation with embedded reinforcement). The reinforcement bars embedded in the foundation provide tensile strength to prevent bending cracks, allowing the cover to be thin without compromising protective function.
3Strength
If various facility devices are embedded deep under the road surface to ensure protection, then the protective function is improved, but the embedding depth increases, making maintenance and inspection difficult
Solution Approach 1:
The facility device is separated from the road surface into two distinct components: the power feeding coil embedded in the concrete foundation at an optimal depth for protection, and the thin facility protection cover that exposes the top surface of the foundation. This segmentation allows the coil to be protected at its optimal embedding depth while the thin cover enables easy access for maintenance and inspection, resolving the contradiction between protection and accessibility.
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 thickness of the concrete while ensuring the protective and functional integrity of the road surface and power feeding efficiency, preventing excessive bending cracks and maintaining efficient power feeding to the power receiving coil.
Implementation Method 1
The cover body is configured to transmit a weight of a vehicle loaded on the cover body to the concrete foundation via the two legs
Implementation Method 2
restrict a separating relative movement of the two legs along a placement surface of the concrete foundation when the weight of the vehicle is loaded on the bridging portion
Data Source
AI summary
A facility protection cover is disposed on a concrete foundation and covers a facility device disposed between the facility protection cover and the concrete foundation. The facility protection cover includes a cover body including a fiber-reinforced cement composite. The cover body includes two legs that are spaced apart from each other so as to be located on opposite sides of a facility device placement space. The facility device placement space accommodates the facility device. The cover body includes a bridging portion that bridges the two legs so as to extend over the facility device placement space. The cover body transmits a weight of a vehicle loaded on the cover body to the concrete foundation via the two legs, and restricts a separating relative movement of the two legs along a placement surface of the concrete foundation when the weight of the vehicle is loaded on the bridging portion.