Inductive Roadway Coil Installation with Dielectric Insulation
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Solution Overview
Problem
Current technologies for direct installation of inductive coils under road pavements face issues with capacitive coupling to the ground, leading to inefficiencies and high costs, and existing solutions require external enclosures or unsuitable materials for road paving.
Innovation Solution
The method involves making a coil and arranging it on a dielectric base, followed by a layer of dielectric material like bituminous lacquer or epoxy resin, and then integrating it into the road structure using traditional paving materials such as cement or asphalt, eliminating the need for external enclosures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inductive coils are installed directly under road pavement, then installation cost is reduced and integration with road infrastructure is improved, but capacitive coupling to ground occurs causing electromagnetic interference and efficiency loss
Solution Approach 1:
A dielectric material layer is introduced as an intermediary between the inductive coil and the conductive road pavement. This dielectric layer acts as a mediator that blocks the direct capacitive coupling path to ground, allowing the coil to be installed directly under the pavement while preventing electromagnetic interference and efficiency loss.
Solution Approach 2:
A thin dielectric coating or film is applied to the inductive coil or placed between the coil and pavement. This thin film provides electrical insulation while maintaining the compact structure needed for direct pavement installation, preventing capacitive coupling without requiring bulky enclosures.
2Reliability
If traditional enclosures are used to protect coils, then protection against atmospheric agents is improved, but space occupation increases and vulnerability to vandalism remains
Solution Approach 1:
The protective enclosure function is merged with the road pavement structure itself. The pavement layers (asphalt, concrete, or other road materials) serve as both the protective covering and the structural element, eliminating the need for separate external enclosures and reducing overall space occupation.
Solution Approach 2:
The road pavement materials serve multiple functions simultaneously: they provide mechanical protection against atmospheric agents (rain, snow, temperature variations), structural support for the coil installation, and electrical insulation through the dielectric layer. This multi-functionality eliminates the need for dedicated protective enclosures.
3Reliability
If fiberglass sheets are used to cover excavations, then coil protection is achieved, but mechanical properties for road paving are insufficient and cost increases
Solution Approach 1:
The material properties are changed by selecting dielectric materials with appropriate electrical insulation characteristics that also possess the mechanical strength required for road paving applications. This ensures both coil protection and sufficient mechanical properties for withstanding traffic loads and environmental conditions.
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 approach reduces capacitive coupling, lowers installation costs, and allows for efficient, low-cost, and protected inductive power transfer systems for electric vehicles, integrating seamlessly with road infrastructure.
Implementation Method 1
The invention solves the problem of the capacitive couplings to ground that are present in case of direct installation of inductive elements under the road pavement
Implementation Method 2
which may suffer from electromagnetic coupling problems, in particular of the capacitive type, relative to the ground in which they have to be positioned
Implementation Method 3
Method for direct roadway installation of inductors for inductive electric power transfer
Data Source
Figure 1
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AI summary
Method for direct roadway installation of inductors for inductive electric power transfer, comprising the steps of: - making a coil and arranging it onto a base of dielectric material, - making an excavation suitable for housing the coil, - depositing a first layer of dielectric material, - positioning the coil, - depositing a second layer of dielectric material, - waiting for the layer of dielectric material to dry, and - depositing a paving layer. In particular, the selected dielectric material is bituminous lacquer or tar paint, or, as an alternative, epoxy resin for transformers. Furthermore, the material of the paving layer is selected among cement, cold asphalt and hot asphalt.