Inclined Casing Surface for Contactless EV Charging
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Solution Overview
Problem
In existing contactless electricity supply systems, foreign objects on the casing surface are heated to high temperatures due to the penetration of magnetic flux lines during electricity supply, as the casing surface is parallel to the radial direction of the electricity supply coil.
Innovation Solution
The casing surface is inclined to gradually approach the outer periphery of the electricity supply or reception coil, reducing the number of magnetic flux lines penetrating foreign objects and preventing overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the casing surface is parallel to the radial direction of the electricity supply coil, then the structure is simple and easy to manufacture, but foreign objects on the casing surface are heated to high temperatures due to magnetic flux penetration
Solution Approach 1:
The patent applies asymmetry by changing the casing surface from a parallel (symmetric) configuration to an inclined (asymmetric) configuration. The inclined surface is designed to gradually approach the outer periphery of the coil, creating an asymmetric geometry that redirects magnetic flux lines and reduces their penetration into foreign objects on the casing surface, thereby preventing overheating while maintaining manufacturing feasibility
Solution Approach 2:
The patent introduces a new dimensional aspect by inclining the casing surface relative to the radial direction of the coil. This dimensional change creates an angular relationship between the casing surface and magnetic flux lines, causing the flux to skim along the inclined surface rather than penetrate perpendicularly into foreign objects, thus reducing heating effects
2Object-affected harmful factors
If the casing surface is inclined to approach the coil periphery, then foreign object heating is reduced, but the device complexity increases
Solution Approach 1:
The patent applies local quality by implementing the inclined surface only in specific regions where foreign objects are most likely to be present and where magnetic flux penetration is most problematic. The inclination angle and extent are locally optimized to reduce heating in critical areas while keeping other portions of the casing simpler in structure
Solution Approach 2:
The patent changes the geometric parameters of the casing surface by introducing an inclination angle relative to the radial direction of the coil. This parameter change is carefully controlled to achieve sufficient flux redirection while maintaining manufacturing feasibility and avoiding excessive structural 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 design effectively prevents foreign objects from overheating by minimizing magnetic flux penetration, while maintaining clearance and power supply efficiency, and can be implemented in both the electricity supply and reception apparatuses.
Implementation Method 1
an electricity supply apparatus that supplies electricity in a contactless manner using electromagnetic induction to an electricity reception section provided in a vehicle
Implementation Method 2
many magnetic flux lines penetrate a foreign object when the foreign object exists on the surface of the casing facing the electricity reception section
Data Source
AI summary
An electricity supply apparatus supplies electricity in a contactless manner to an electricity reception section provided in a vehicle, the apparatus including: an electricity supply coil configured to supply electricity to an electricity reception coil of the electricity reception section, the electricity supply coil having a ring shape, an in-edge, an out-edge, and a mid-point, the inn-edge being adjacent to a hollow portion of the ring shape in a radial direction of the electricity supply coil, the out-edge being outer than the inn-edge in the radial direction, and the mid-point being between the inn-edge and the out-edge in the radial direction; and a casing which houses the electricity supply coil, the casing having a first surface configured to face the electricity reception section and a second surface on which the electricity supply coil is located.