Inductive Vehicle Charging via Ferromagnetic Wheel Rim
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Solution Overview
Problem
Existing methods for charging electric vehicles are complex and inefficient, particularly in contactless energy transmission, which often result in significant energy loss and require close proximity between the primary and secondary conductors.
Innovation Solution
A device utilizing an inductively coupled system where a primary conductor, wound around a U-shaped coil core, transfers energy to a secondary winding on a vehicle's wheel rim, which is ferromagnetic and electrically conductive, allowing for efficient energy transmission over large distances with reduced air gaps and scattering losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If contactless energy transmission is used, then charging convenience is improved, but energy loss increases
Solution Approach 1:
The vehicle body serves as an intermediary conductor between the ground-based primary conductor and the charging system. The vehicle's metallic body naturally present structure is utilized to receive electromagnetic induction from the ground conductor and transfer energy to the charging terminal, eliminating the need for dedicated receiving coils while reducing energy loss through direct conductive path utilization.
2Length of stationary object
If the distance between primary and secondary conductors is increased, then installation flexibility is improved, but transmission efficiency deteriorates
Solution Approach 1:
The vehicle body acts as an extended intermediary that bridges the gap between the ground-based primary conductor and the charging terminal. By utilizing the vehicle's existing metallic structure as a conductive medium, the system maintains efficient energy transfer over larger distances without requiring the secondary conductor to be in close proximity to the primary conductor.
3Reliability
If a dedicated secondary winding is installed on the vehicle, then energy reception capability is improved, but device complexity increases
Solution Approach 1:
The vehicle body serves multiple functions: it acts as the structural framework, the protective enclosure, and simultaneously as the electromagnetic receiving conductor for wireless charging. This multi-functional utilization eliminates the need for separate dedicated receiving coils or windings, reducing system complexity while maintaining effective energy reception capability.
4Loss of energy
If ferromagnetic material is used for the vehicle body, then magnetic field guidance is improved, but manufacturing cost increases
Solution Approach 1:
The system is designed to work with the existing electromagnetic properties of common vehicle body materials. By optimizing the grounding system and primary conductor configuration, the invention achieves effective energy transfer without requiring special ferromagnetic materials, thus avoiding increased manufacturing costs while maintaining good magnetic field guidance through proper system design.
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 solution enables efficient, contactless energy transfer to electric vehicles with reduced energy losses, allowing for cost-effective production and efficient power delivery, while also enabling data transmission and vehicle identification, thus simplifying the charging process.
Implementation Method 1
a primary conductor (23) can be inductively coupled to an annular part (21) of the vehicle (1), the annular part (21) being rotatably mounted on the vehicle (1)
Implementation Method 2
the ring-shaped part consists of an electrically conductive and ferromagnetic material. The advantage here is that the field flux between the elevations can be guided through the ring-shaped part
Data Source
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AI summary
The invention relates to a device for transferring energy to a vehicle without contact, to a vehicle, and to the use of a rim of a vehicle, wherein a primary conductor can be arranged so as to be inductively coupled to an annular part of the vehicle, wherein the annular part is rotatably mounted on the vehicle, in particular on the frame of the vehicle, wherein a secondary winding is arranged on the vehicle so as to be inductively coupled to the annular part.