Coil Unit Structure With Supported Lid for Load-Robust Maintenance
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Solution Overview
Problem
Existing contactless electric power transmission systems face challenges in maintaining the robustness and ease of maintenance of coil units due to increased size and weight, leading to higher construction costs and reduced robustness against vehicle loads.
Innovation Solution
A coil unit design featuring a coil support portion with a penetration hole, an accommodation portion, a lid portion, and yoke portions made of magnetic materials, which are embedded in a travel path with a base portion for support, allowing for improved maintenance and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lid member is provided to close the case accommodating the electric power transmission coil, then the coil unit is protected, but the size and weight of the structure body are increased
Solution Approach 1:
The patent divides the protective structure into separate functional components: a case for accommodating the coil, a lid member for closing the case, and support members for structural reinforcement. This segmentation allows each component to be optimized independently, reducing overall weight while maintaining protection.
Solution Approach 2:
The support members are inserted into the air core region of the electric power transmission coil, utilizing the existing space within the coil structure. This nesting approach provides structural support without adding external weight, as the support members are housed within the existing coil geometry.
2Reliability
If a lid member is provided to close the case accommodating the electric power transmission coil, then the coil unit is protected, but the construction cost is increased
Solution Approach 1:
By segmenting the protective structure into a case, lid member, and support members, each component can be manufactured separately using standard processes and assembled in the field. This reduces construction complexity and cost compared to manufacturing a single integrated protective structure.
Solution Approach 2:
The lid member is designed to be openable and closable, allowing dynamic access to the coil unit for maintenance and inspection. This design extends the service life of the coil unit by enabling easy maintenance, thereby reducing long-term construction and operational costs.
3Stability of the object's composition
If a support member is provided to support the lid member, then structural stability is improved, but the robustness against vehicle loads is insufficient
Solution Approach 1:
The support members are nested within the air core region of the coil, utilizing the existing space to provide structural reinforcement. This placement allows the support members to directly bear vehicle loads and transfer them to the case and base, improving robustness without adding external structural elements.
Solution Approach 2:
The support members are made of non-magnetic resin material, which combines mechanical strength with magnetic field transparency. This composite material approach provides both structural stability and robustness against vehicle loads while maintaining electromagnetic performance.
4Strength
If the coil structure body size is increased to improve robustness, then load bearing capacity is improved, but construction work and cost are increased
Solution Approach 1:
The support members are inserted into the existing coil structure's air core region, providing load bearing capacity without increasing the overall external dimensions of the coil unit. This nested approach allows robustness improvement while maintaining a compact construction footprint.
Solution Approach 2:
The structural reinforcement is achieved through separate support members that can be independently installed into the existing coil structure. This segmentation allows for simpler construction work compared to manufacturing and installing a completely new larger structure body.
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, reduces construction time, and ensures robustness by preventing direct external loads from acting on the coil, while maintaining a high coupling coefficient.
Implementation Method 1
a coil that transmits or receives electric power by contactless electric power transmission
Implementation Method 2
a first yoke portion (14) that is made of a magnetic material and is arranged on a rear side of the coil when seen from a lid portion side in an axis line direction parallel to the center axis line; and a second yoke portion (15, 16) that is made of a magnetic material and is arranged so as to surround each of the lid portion side and a coil support portion side of a circumference of the accommodation portion in the penetration hole
Data Source
AI summary
A coil unit includes a coil structure body, a lid portion, an accommodation portion, and an electric device. The coil structure body includes a coil and a coil support portion that supports the coil. The accommodation portion is arranged in a penetration hole formed on the coil support portion. The accommodation portion accommodates the electric device at an inside of the accommodation portion. The lid portion closes and opens an open end of the penetration hole of the coil support portion. The lid portion is supported by the accommodation portion when the penetration hole is closed.