Stator Insulating Material for High-Density Coil Isolation
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Solution Overview
Problem
Conventional insulating materials fail to provide excellent insulation characteristics as coil density increases in motors for vehicles, particularly in hybrid and electric vehicles, leading to challenges in securing vehicle interior space, reducing weight, and lowering costs.
Innovation Solution
An insulating material comprising an epoxy resin, a curing agent, and spherical inorganic filler is developed, offering improved insulation and dimensional stability, suitable for high coil density applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional insulating materials (varnish or general resin) are used, then the manufacturing process is simple, but insulation characteristics deteriorate when coil density increases
Solution Approach 1:
The patent uses a composite material consisting of epoxy resin combined with spherical inorganic filler particles (average diameter 1-10 μm). This composite structure provides both excellent insulation characteristics and the ability to fill narrow gaps effectively, resolving the contradiction between maintaining insulation performance and adapting to high coil density configurations.
Solution Approach 2:
The patent changes the physical parameters of the insulating material by controlling the particle size distribution of spherical inorganic fillers (average diameter 1-10 μm) and optimizing the epoxy resin composition. These parameter changes enable the material to maintain fluidity for filling narrow gaps while providing sufficient insulation performance for high coil density applications.
2Power
If coil density is increased to improve motor performance and reduce size, then output increases and vehicle interior space is secured, but insulation between coils becomes insufficient with conventional materials
Solution Approach 1:
The epoxy resin composite with spherical inorganic filler provides enhanced insulation properties that maintain electrical isolation between coils even when spacing is reduced for high-density configurations. The composite structure ensures both insulation reliability and gap-filling capability.
Solution Approach 2:
The spherical inorganic filler particles (1-10 μm) are specifically designed to concentrate in narrow gaps between coils, providing localized insulation enhancement exactly where needed in high-density coil arrangements, while the epoxy resin matrix provides overall structural binding.
3Manufacturing precision
If general resin molding is used for gap filling, then the process is straightforward, but dimensional stability is insufficient for high precision requirements
Solution Approach 1:
The epoxy resin composite with spherical inorganic filler inherently provides superior dimensional stability due to the rigid filler particles embedded in the resin matrix. This eliminates the need for complex post-processing or specialized molding techniques, maintaining ease of manufacture while achieving high precision.
Solution Approach 2:
The patent optimizes the particle size parameters of the spherical inorganic filler (average diameter 1-10 μm) to achieve the right balance between flowability for easy molding and rigidity for dimensional stability. This parameter optimization allows straightforward molding processes to produce high-precision results.
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 insulating material ensures effective insulation and mechanical strength, enabling tight sealing and easy molding, suitable for high-output and downsized vehicle motors.
Implementation Method 1
an insulating material for a stator contains an epoxy resin, a curing agent, and a spherical inorganic filler
Data Source
AI summary
An insulating material for a stator contains an epoxy resin, a curing agent, and a spherical inorganic filler, and is used for insulation between coils of a stator.