Boron Nitride Polyester Insulation for Motor Thermal Management
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Solution Overview
Problem
Existing electrical insulation materials for stator windings in motors and generators exhibit poor thermal conductivity, leading to heat buildup and increased electrical resistance, necessitating larger conductor cross-sections and increased material usage.
Innovation Solution
A sheet-like insulation material precursor comprising interconnected layers of polyester nonwoven, polyester film, and polyester nonwoven with a B-stage resin containing at least 5% boron nitride, which is temporarily heated to enhance thermal conductivity by allowing boron nitride particles to penetrate and polymerize within the layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional insulation materials are used, then electrical insulation is provided, but thermal conductivity is poor leading to heat buildup
Solution Approach 1:
The patent applies composite materials by combining polyester nonwoven layers, polyester film, and resin layers containing boron nitride particles. This multi-layer composite structure achieves both electrical insulation and enhanced thermal conductivity, resolving the contradiction between insulation performance and heat dissipation capability.
Solution Approach 2:
The patent changes the thermal conductivity parameter of the insulation material by incorporating boron nitride particles into the resin layers. This parameter modification enables the material to conduct heat effectively while maintaining its electrical insulation properties, addressing the heat buildup issue.
2Reliability
If conductor cross-section is increased to compensate for heat buildup, then electrical performance is maintained, but material usage increases
Solution Approach 1:
By using composite insulation material with boron nitride-enhanced thermal conductivity, the patent enables effective heat dissipation without requiring larger conductor cross-sections. This maintains electrical performance while reducing copper material usage compared to conventional insulation approaches.
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
The solution significantly improves thermal conductivity by a factor of 3 to 5, reducing heat buildup and allowing for a smaller conductor cross-section, thereby optimizing electrical performance and material efficiency.
Implementation Method 1
the resin being at a B-stage and having a weight fraction of at least 5% of boron nitride
Implementation Method 2
temporarily heating the insulation material precursor to a baking temperature
Data Source
AI summary
An exemplary sheetlike insulation material precursor and an exemplary insulation material are disclosed that can feature a particularly high thermal conductivity. The insulation material precursor can be characterized in that a layer of resin on each of two outer sides of a core laminate of interconnected polyester nonwovens and a polyester film is at the B-stage and has a weight fraction of at least 5% of boron nitride.