Rolled Inductor with Thermal Pottant Substrate
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Solution Overview
Problem
Existing inductors face challenges in efficiently dissipating heat due to the limitations of traditional potting materials, which often compromise between plasticity for filling cavities and thermal conductivity for heat transfer.
Innovation Solution
The use of a high thermal conductivity substrate layer made from pottant material, which is formed in layers and wrapped around cores to create a toroidal or octagonal inductor structure, allowing for efficient heat dissipation without requiring high plasticity or flowability in the potting material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional pottant materials are used to fill the cavity between windings and outer casing, then the material can be poured easily due to high plasticity, but the thermal transfer efficiency is reduced
Solution Approach 1:
The patent changes the physical state parameter of the pottant material from liquid/pourable to solid/pre-formed. The pottant is provided as a pre-formed solid structure that is placed into the cavity rather than being poured, eliminating the need for high plasticity while enabling the use of materials with superior thermal conductivity properties
Solution Approach 2:
The patent employs composite material structures where the pottant may combine materials with high thermal conductivity properties. The pre-formed pottant structure can incorporate thermally conductive fillers or composite formulations that achieve optimal thermal transfer while maintaining structural integrity
2Temperature
If pottant material with high thermal conductivity is selected, then heat transfer efficiency is improved, but the material may lack the required plasticity for pouring
Solution Approach 1:
The pottant is prepared in advance as a pre-formed solid structure with optimized thermal conductivity properties. This preliminary formation allows selection of materials based purely on thermal performance without compromise for pourability, as the shaping is completed during manufacturing rather than during application
Solution Approach 2:
The patent fundamentally changes the application method parameter from liquid pouring to solid placement. This parameter change decouples the material selection criteria, allowing optimization for thermal conductivity independently from rheological properties that would be required for pouring
3Temperature
If a pre-formed solid pottant structure is used instead of pourable material, then thermal conductivity is improved, but the ability to fully fill complex cavities may be reduced
Solution Approach 1:
The pre-formed pottant is divided into multiple segments or sections that can be separately positioned and assembled within the cavity. This segmentation allows the solid structure to adapt to complex geometries and fully fill irregular cavities while maintaining the thermal performance benefits of solid pre-formed material
Solution Approach 2:
The pottant structure is designed to nest within the cavity formed by the inner and outer walls, with the pre-formed solid structure conforming to the available space. The nested configuration ensures complete filling of the cavity while maintaining structural integrity and optimal thermal pathways
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 enables effective heat transfer from windings to the outer casing, enhancing thermal management and reducing heat-related issues in inductors by selecting materials with high thermal conductivity regardless of their rheological properties.
Implementation Method 1
The pottant selected should have as high of a coefficient of thermal transfer as possible, in order to maximize heat transfer to the outer casing
Data Source
AI summary
An apparatus includes a substrate layer formed from a pottant material that extends longitudinally in an unwound state. Cores are spaced longitudinally along the substrate layer and joined to the substrate at a first surface. The apparatus further includes pottant segments joined to the cores at a second surface opposite the first surface.