Manhole-Mounted Coil Unit for Easier Wireless Power Maintenance
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Solution Overview
Problem
Existing contactless electric power transmission systems for vehicles face challenges in maintenance due to buried components, which complicate tasks and may reduce efficiency and safety.
Innovation Solution
A coil unit with a housing fixed inside a travel path hole, allowing easy exposure and maintenance, and an inner member protruding through a lid portion to prevent load and efficiency loss, with components arranged within a buried cylindrical member for improved durability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support base is buried in the travel path, then travel safety is ensured, but maintenance work becomes complicated and difficult
Solution Approach 1:
The device is divided into two main segments: a buried support base that remains fixed in the ground, and a removable lid portion that can be easily taken off for maintenance. This segmentation allows the critical power transmission components to be protected and stable while enabling easy access for maintenance work by simply removing the lid portion.
Solution Approach 2:
The lid portion is extracted as a separate removable component from the buried support base. This extraction allows maintenance personnel to easily remove the lid portion to access and maintain the coil and other components inside, without needing to excavate the buried support base, thus significantly improving maintenance ease while keeping the support base securely buried for travel safety.
2Reliability
If the coil unit is buried under pavement, then travel safety is ensured, but electric power transmission efficiency decreases
Solution Approach 1:
The lid portion is designed with a specific local quality - it is substantially transparent to magnetic fields. This allows the lid to cover the coil unit for protection and stability while permitting magnetic flux to pass through efficiently, thus maintaining high power transmission efficiency without compromising travel safety through proper burial of the support base.
3Strength
If the housing is fixed inside the hole portion and integrally fixed to the lid portion, then durability is improved, but device complexity increases
Solution Approach 1:
The housing is merged with the lid portion through integral fixation, creating a unified structure that provides both durability and ease of maintenance. The housing is fixed inside the hole portion to provide structural strength, while being integrally connected to the removable lid portion, allowing the entire assembly to be easily removed and replaced as a single unit, thus improving durability without significantly increasing operational 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
Enhances maintenance ease, durability, and efficiency by preventing direct vehicle loads and reducing magnetic path length, ensuring desired output and efficiency in electric power supply.
Implementation Method 1
a coil that transmits electric power in a contactless manner to an electric power reception device
Data Source
AI summary
A coil unit includes: a coil; a housing that accommodates the coil; and an inner member that is inserted in an empty core region of the coil. The coil transmits electric power in a contactless manner to an electric power reception device. The housing is fixed to a rear surface of a lid of a manhole buried in the ground of a travel path. The inner member protrudes to the outside through the housing. A surface of the inner member is exposed to the outside from a surface of the lid portion.