Resin Impregnated Insulating Tapes Compression for Thermal Conductivity
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Solution Overview
Problem
Conventional electrical insulation materials, such as epoxy resin-based tapes, exhibit high thermal insulation properties that reduce the efficiency and durability of electrical equipment, as they hinder heat dissipation while providing good electrical insulation.
Innovation Solution
Incorporating high thermal conductivity (HTC) materials like silica, alumina, and silicon carbide into the resin matrix, followed by compression to reduce the mean distance between these materials below the phonon path length, enhancing phonon flow and thermal conductivity without compromising electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional epoxy resin-based insulation tapes are used to provide electrical insulation, then electrical insulation performance is improved, but thermal insulation increases which reduces heat dissipation efficiency
Solution Approach 1:
The patent applies composite materials by combining conventional epoxy resin with high thermal conductivity (HTC) filler particles such as aluminum oxide, aluminum nitride, or boron nitride. This creates a composite insulation material that maintains the electrical insulation properties of the resin while introducing thermal conduction pathways through the dispersed HTC particles, thereby resolving the contradiction between electrical insulation and heat dissipation
Solution Approach 2:
The patent changes the thermal conductivity parameter of the insulation material by incorporating HTC particles with thermal conductivity values significantly higher than the base resin (e.g., aluminum oxide with 20-30 W/mK versus epoxy resin with 0.2-0.5 W/mK). This parameter modification allows the material to conduct heat more effectively while maintaining its electrical insulation properties
2Reliability
If multiple layers of mica tape are wrapped around coils to provide high voltage insulation, then electrical insulation is improved, but thermal dissipation becomes more difficult
Solution Approach 1:
The patent modifies the thermal conductivity parameter of the insulation tape by impregnating the mica tape layers with resin containing HTC particles. This allows the multi-layer insulation structure to maintain its electrical insulation capability while achieving improved thermal conduction to manage the temperature in high voltage coils
3Reliability
If insulation systems are designed with maximum electrical insulation characteristics, then electrical performance is improved, but thermal insulation increases which reduces system efficiency
Solution Approach 1:
The patent uses composite materials consisting of epoxy resin matrix embedded with high thermal conductivity particles (such as aluminum oxide, aluminum nitride, or boron nitride). This composite structure enables the insulation system to simultaneously achieve maximum electrical insulation through the resin matrix and optimal thermal conduction through the HTC particle network, thereby resolving the contradiction between electrical performance and system efficiency
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 increases thermal conductivity of the resin impregnated tapes, improving heat dissipation while maintaining electrical insulation performance, thereby enhancing the efficiency and durability of electrical systems.
Implementation Method 1
facilitates the dispersion of phonons through a high thermal conductivity (HTC) impregnated medium by the compression of the medium to reduce the mean distances between the HTC materials below that of the mean phonon path length. This reduces the phonon scattering and produces a greater net flow of phonons away from the heat source
Data Source
AI summary
The present invention provides for a method of impregnating a matrix with a high thermal conductivity filled resin 32, which produces a resin impregnated matrix. The high thermal conductivity material 30 comprises 5-60% by volume of the resin 32. This is compressed by approximately 5-30%, and the distances between the high thermal conductivity materials loaded in the resin are reduced, and the resin is then cured.