Wheel-Integrated Stacked Coil for Stable Road Wireless Charging
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Solution Overview
Problem
In wireless power transfer systems where a power transmission device in a road surface and a power reception device in a vehicle are far apart, obstacles such as small animals or metal objects can interfere, leading to reduced power reception efficiency and potential fires.
Innovation Solution
A wireless power reception system with a power reception coil housed in a wheel, featuring a stacked plurality of spiral coil layers, which receives power from a power transmission coil in the road surface and transmits it to an onboard device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the power transmission device and power reception device are placed far apart, then the coverage area is increased, but power reception efficiency decreases and obstacles may interfere
Solution Approach 1:
The power reception coil is moved from the vehicle body to the wheel, changing the spatial dimension of power reception. This allows the coil to be positioned closer to the road surface where the transmission device is located, reducing the air gap and improving coupling efficiency while maintaining coverage area
Solution Approach 2:
The power reception coil is housed within the wheel structure, nesting the power reception function inside an existing vehicle component. This eliminates the need for separate mounting space on the vehicle body and allows closer positioning to the road surface
2Reliability
If the power reception coil is placed close to the road surface, then power reception efficiency improves, but the coil is exposed to obstacles and debris
Solution Approach 1:
The power reception coil is nested within the wheel structure, which provides physical protection from obstacles and debris on the road surface. The wheel itself acts as a protective barrier while maintaining the coil's close proximity to the road for efficient power transfer
Solution Approach 2:
The coil is housed within the wheel structure which acts as a protective shell. This enclosure protects the delicate coil from direct exposure to road obstacles, debris, and environmental factors while allowing electromagnetic field penetration
3Device complexity
If a single-layer spiral coil is used, then the device complexity is reduced, but the power reception efficiency and compactness are compromised
Solution Approach 1:
The design transitions from a single-layer planar coil to a multi-layer stacked spiral configuration. This adds the vertical dimension (stacking layers) to the traditional planar spiral, increasing the effective winding area and coupling efficiency without significantly increasing manufacturing complexity
Solution Approach 2:
The coil structure is segmented into multiple identical spiral layers stacked vertically. Each layer is a complete spiral winding, and stacking them provides cumulative effect for improved efficiency while maintaining modular simplicity in design and manufacturing
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 improves power reception efficiency by minimizing interference from obstacles and allows for a more compact coil design, enhancing the stability and effectiveness of wireless power transfer.
Implementation Method 1
a power reception coil that receives power supplied wirelessly from a power transmission coil of a power transmission device installed in a road surface
Implementation Method 2
the power reception coil includes a stacked plurality of spiral coil layers
Data Source
AI summary
A wireless power reception system 1 includes: a power reception device 5 including a power reception coil 51 that receives power supplied wirelessly from a power transmission coil 41 of a power transmission device 4 installed in a road surface, at least a portion of the power reception coil 51 being housed in a wheel 3 of a moving body 2; and an onboard device 6 which is installed in the moving body 2 and which is electrically connected to the power reception device 5, wherein the power reception device 5 can transmit received power to the onboard device 6, and the power reception coil 51 includes a stacked plurality of spiral coil layers 52a and 52b.