Rotary Motor Epoxy Composition for High-Temperature Insulation
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Solution Overview
Problem
Existing epoxy resins used in rotary electric machines do not provide sufficient heat resistance at high operating temperatures, which can lead to improper functioning of EV motors.
Innovation Solution
A curable epoxy composition comprising an alicyclic epoxy compound, an acid anhydride-based curing agent, and an imidazole-based curing accelerator, optionally with a polyester polyol and inorganic filler, to form a cured product with excellent heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional epoxy resins are used, then the resin provides basic sealing and insulation functions, but the heat resistance is insufficient at high operating temperatures (180°C or higher)
Solution Approach 1:
The patent changes the chemical parameters of the epoxy resin by selecting specific combinations of epoxy compounds (alicyclic, aromatic, aliphatic types with specific molecular weights and epoxy values), curing agents (acid anhydride, amine, carboxylic acid), and curing accelerators (imidazole, organometallic compounds). This chemical parameter optimization raises the glass transition temperature and decomposition temperature, enabling the resin to maintain structural integrity and electrical insulation properties at operating temperatures of 180°C or higher, thus resolving the heat resistance deficiency of conventional epoxy resins
Solution Approach 2:
The patent creates a composite resin system by combining multiple epoxy compounds with different chemical structures (alicyclic, aromatic, aliphatic), various curing agents, and specific curing accelerators. This composite approach synergistically enhances the thermal stability, mechanical strength, and electrical insulation properties of the cured resin, allowing it to withstand high-temperature operating environments without degradation, thereby achieving both improved heat resistance and reliable operation
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 composition forms a cured product with high glass transition temperature and improved flexibility, enabling proper operation of rotary electric machines even at elevated temperatures.
Implementation Method 1
a curable epoxy composition including an alicyclic epoxy compound (A) having an alicyclic structure and an epoxy group in a molecule, an acid anhydride-based curing agent (B)
Implementation Method 2
an imidazole-based curing accelerator (C)
Data Source
AI summary
Provided is a curable epoxy composition capable of forming a cured product having excellent heat resistance even in a high temperature environment. A first curable epoxy composition includes an alicyclic epoxy compound (A) having an alicyclic structure and an epoxy group in a molecule, an acid anhydride-based curing agent (B), and an imidazole-based curing accelerator (C), and is liquid at 25° C. and to be used for a rotary electric machine. A second curable epoxy composition includes an alicyclic epoxy compound (A) having an alicyclic structure and an epoxy group in a molecule, an acid anhydride-based curing agent (B), an imidazole-based curing accelerator (C), and a polyester polyol (D), and is to be used for a rotary electric machine.