Inductor Coil Thermal Coupling via Insulating Lids
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Solution Overview
Problem
Existing inductor assemblies face challenges in achieving effective thermal coupling while maintaining electrical insulation between the inductor coil and the metallic housing, often requiring separate insulation and thermally conductive fillers that can compromise electric insulation and increase production costs.
Innovation Solution
The design incorporates coil lids made of electrically insulating material to maintain a minimum creepage distance between the inductor winding and the metallic housing, eliminating the need for thermally conductive fillers in the potting material and enhancing heat transfer through interfaces not reliant on the potting material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermally conductive filler particles are added to the potting material to improve thermal coupling, then thermal conductivity is improved, but electric insulation reliability deteriorates due to dielectric breakdown risk
Solution Approach 1:
The patent removes the thermally conductive filler particles from the potting material, extracting the harmful element that caused dielectric breakdown. Instead of relying on filler particles for thermal conduction, the design uses direct thermal coupling paths through the housing structure, eliminating the conflict between thermal conductivity and electric insulation reliability.
Solution Approach 2:
The patent employs a composite structure where the potting material serves primarily for mechanical support and electrical insulation, while thermal management is achieved through separate thermal pathways using materials optimized for heat conduction (such as metallic housing and dedicated thermal interfaces), allowing each material to perform its optimal function without compromising the other.
2Reliability
If separate electric insulation is added around the inductor winding to improve electric insulation, then electric insulation reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the electric insulation function into the existing potting material and housing structure. The potting material itself provides electrical insulation between the inductor winding and housing, while the housing structure is designed to provide both mechanical support and electrical insulation pathways, eliminating the need for separate insulation components and reducing overall device complexity.
Solution Approach 2:
The patent makes the potting material and housing structure multi-functional: they simultaneously provide mechanical support, electrical insulation, and thermal management pathways. This universal approach allows single components to fulfill multiple functions, reducing the total number of parts and simplifying the overall device structure while maintaining reliability.
3Volume of moving object
If the inductor coil is positioned closer to the metallic housing to reduce installation space, then volume is reduced, but thermal coupling efficiency deteriorates
Solution Approach 1:
The patent segments the thermal management function into dedicated thermal pathways separate from the electrical insulation requirements. By creating specific thermal conduction paths through the housing structure and using thermal interfaces at key contact points, the design enables effective heat transfer even when the inductor coil is positioned close to the housing, decoupling the spatial constraints from thermal performance.
Solution Approach 2:
The patent addresses thermal coupling not just through radial distance but by utilizing multiple dimensional pathways: direct contact points, thermal conduction through the housing walls, and convection paths within the potting material. This multi-dimensional thermal management approach allows compact positioning while maintaining effective heat dissipation through alternative routes.
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 approach ensures reliable electric insulation and efficient thermal coupling without the risk of dielectric breakdown, allowing for a cost-effective production method with optimized thermal conductivity and reduced installation space requirements.
Implementation Method 1
a potting material both contacting the inductor coil and the inductor housing and thermally coupling the inductor coil to the inductor housing
Data Source
AI summary
An inductor assembly includes at least one inductor coil, a metallic inductor housing at least partially enclosing the inductor coil, and a potting material both contacting the inductor coil and the metallic inductor housing and thermally coupling the inductor coil to the metallic inductor housing. The inductor coil includes a bobbin made of electrically insulating material, and an inductor winding made of an electric conductor wound on the bobbin. The inductor winding further has an outer circumference and two end faces, and an electric insulation covers the outer circumference of the inductor winding. Coil lids made of electrically insulating material at least partially cover the end faces of the inductor winding and adjacent areas of the electric insulation covering the outer circumference of the inductor winding such that a distance of any point of the end faces of the inductor winding to the metallic housing along any way not passing through the electrically insulating material of the coil lids or the bobbin is at least a required minimum creepage distance.