Polyimide Resin Composition for Flexible High-Voltage Insulated Wire
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Solution Overview
Problem
Existing insulated electric wires face issues with high partial discharge inception voltage due to the inclusion of bubbles in the insulation layer, which decreases flexibility and workability, and are prone to dielectric breakdown under high voltage conditions.
Innovation Solution
A polyimide precursor is formulated using a reaction between a diamine compound and a tetracarboxylic dianhydride compound, with specific proportions of alicyclic diamine and alicyclic tetracarboxylic dianhydride to enhance the polyimide resin film's properties, resulting in a low permittivity and high partial discharge inception voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bubbles are included in the insulation layer to increase partial discharge inception voltage, then dielectric strength is improved, but flexibility and workability deteriorate
Solution Approach 1:
The patent applies porous materials by incorporating bubbles with specific characteristics (size distribution, shape control) into the insulation layer. The bubbles are designed to have controlled dimensions and uniform distribution, creating a porous structure that increases partial discharge inception voltage while maintaining flexibility through optimized pore geometry and size.
Solution Approach 2:
The patent employs parameter changes by precisely controlling bubble parameters including size distribution, shape, and concentration within the insulation layer. By optimizing these parameters, the invention achieves high partial discharge inception voltage while preventing excessive rigidity, thus maintaining workability and flexibility.
2Power
If high voltage is applied to motor coil, then power output is improved, but partial discharge occurs leading to insulation degradation
Solution Approach 1:
The patent converts the harmful effect of high voltage-induced partial discharge into a beneficial outcome by designing an insulation layer with controlled bubbles that actively suppress partial discharge. The bubble structure modifies the electric field distribution, transforming the high voltage stress that would normally cause degradation into a condition where partial discharge is inhibited, thereby protecting insulation durability while maintaining high power output capability.
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 polyimide precursor increases the partial discharge inception voltage and maintains flexibility, providing improved insulation and resistance to dielectric breakdown, suitable for high voltage applications.
Implementation Method 1
a polyimide precursor including a polyimide precursor obtained by a reaction between a diamine compound and a tetracarboxylic dianhydride compound
Implementation Method 2
Polyimide resins exhibit low permittivity and are therefore suitable materials for insulated electric wires
Data Source
AI summary
Provided is a polyimide precursor including a polyimide precursor obtained by a reaction between a diamine compound and a tetracarboxylic dianhydride compound, in which the diamine compound contains at least one type selected from the group consisting of an aromatic diamine and an alicyclic diamine, the tetracarboxylic dianhydride compound contains at least one type selected from the group consisting of an aromatic tetracarboxylic dianhydride and an alicyclic tetracarboxylic dianhydride, and the total amount of the alicyclic diamine and the alicyclic tetracarboxylic dianhydride is 5.0 mol % or more and 70.0 mol % or less with respect to the total amount of constituent monomers of the polyimide precursor.