Vehicle Wheel Power Receiving Coil Layout Against Obstacle Interference
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Solution Overview
Problem
Conventional wireless power supply systems face reduced power receiving efficiency and risk of obstacles igniting due to distance and interference between power transmission and receiving devices, especially when obstacles enter the space between them.
Innovation Solution
A wireless power receiving system where part of the power receiving coil is integrated into a vehicle wheel, allowing for efficient power transmission directly from a road-based power transmission coil to in-vehicle devices, reducing interference and obstacles by maintaining the coil plane opposite the ground surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power receiving device is installed on the underside of the vehicle at a distance from the road surface, then the vehicle can receive electric power from a power transmission device installed on the road surface, but obstacles such as small animals or metal pieces may enter the space between the power receiving device and the power transmission device, causing eddy currents to be generated around the obstacles, reducing power receiving efficiency and potentially heating and igniting the obstacles
Solution Approach 1:
The power receiving coil is integrated into the vehicle wheel, changing the spatial arrangement from a horizontal configuration (underside of vehicle) to a vertical configuration (within wheel structure). This dimensional change eliminates the gap between the power transmission device on the road and the power receiving device, preventing obstacles from entering the magnetic field space while maintaining effective power transfer.
Solution Approach 2:
The power receiving coil is nested within the vehicle wheel structure, specifically positioned in the hub or rim area. This nesting approach integrates the power receiving function into the existing wheel assembly, eliminating the need for separate mounting space underneath the vehicle and removing the harmful gap where obstacles could interfere with the magnetic field.
2Loss of energy
If the distance between the power transmission device and the power receiving device is reduced to prevent obstacle interference, then power receiving efficiency improves, but the integration complexity into the vehicle wheel increases
Solution Approach 1:
The vehicle wheel is designed to serve multiple functions: mechanical support, rotation, and wireless power reception. By integrating the power receiving coil into the wheel structure, the wheel becomes a multi-functional component that eliminates the need for separate power receiving devices underneath the vehicle, reducing overall system complexity despite the integration requirements.
Solution Approach 2:
The power receiving coil is merged with the vehicle wheel assembly, combining the power reception function with the mechanical wheel structure. This merging eliminates the need for separate mounting structures and reduces the overall system complexity by integrating multiple functions into a single component 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 enhances power receiving efficiency and safety by minimizing the risk of obstacles interfering with the magnetic field and allows for improved power transmission to in-vehicle devices, such as in-wheel motors and storage units.
Implementation Method 1
a power receiving device (5) having a power receiving coil (51) configured to receive electric power supplied wirelessly from a power transmission coil (41) of a power transmission device (4)
Implementation Method 2
an obstacle such as a small animal or a piece of metal may enter a space between the power receiving device and the power transmission device, thus causing eddy currents to be generated around the obstacle
Data Source
AI summary
A wireless power receiving system includes: a power receiving device having a power receiving coil configured to receive electric power supplied wirelessly from a power transmission coil of a power transmission device installed on a road surface, at least part of the power receiving coil being contained in a vehicle wheel; and in-vehicle devices installed in a mobile object, the in-vehicle devices being energizably connected to the power receiving device. The power receiving device transmits the received electric power to the in-vehicle devices.