Stator Core Insulation Using LCP Polymer for Small Slot Heat Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stator cores in electric vehicles face challenges with the incorporation of traditional insulators like Nomex™ paper, which are costly, difficult to integrate into small slots, and lack properties such as heat resistance, high flowability, and thermal conductivity.
Innovation Solution
A stator core design featuring a stator body with spaced slot segments and intermediate slots, where an insulative member made of a polymer composition with a thermotropic liquid crystalline polymer is disposed. This polymer composition exhibits low melt viscosity, high deflection temperature under load, and excellent thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional insulators like Nomex™ paper are used in stator cores, then insulation is provided, but manufacturing difficulty increases and cost increases while heat resistance and thermal conductivity are insufficient
Solution Approach 1:
The patent changes the physical and chemical parameters of the insulating material by using a polymer composition with specifically controlled melt viscosity (300 Pa-s or less) and deflection temperature (170°C or more). This allows the material to be easily processed during manufacturing while simultaneously providing superior heat resistance, resolving the contradiction between ease of manufacture and reliability.
Solution Approach 2:
The patent employs a composite polymer composition that combines multiple properties (low melt viscosity, high deflection temperature, high thermal conductivity) into a single insulative member material. This composite approach allows the insulator to be easily manufactured while providing enhanced heat resistance and thermal management, overcoming the limitations of traditional Nomex™ paper.
2Reliability
If traditional insulators like Nomex™ paper are used in stator cores, then insulation is provided, but thermal conductivity is insufficient for heat dissipation
Solution Approach 1:
The patent modifies the thermal parameters of the insulating material by selecting a polymer composition with high thermal conductivity while maintaining appropriate processability. The deflection temperature of 170°C or more ensures the material can withstand manufacturing processes, while the enhanced thermal conductivity enables effective heat dissipation from the stator windings.
3Productivity
If small slots in stator core are used, then power density is increased, but incorporation of traditional insulators becomes difficult
Solution Approach 1:
The patent changes the rheological parameters of the insulating material by using a polymer composition with melt viscosity of 300 Pa-s or less. This low viscosity allows the material to flow easily into small slots during manufacturing, enabling the use of high power density stator designs without compromising the ability to incorporate insulators properly.
4Ease of manufacture
If cost-effective materials are used, then manufacturing cost is reduced, but performance properties like heat resistance and thermal conductivity may be compromised
Solution Approach 1:
The patent develops a composite polymer composition that achieves multiple performance properties (heat resistance, thermal conductivity, mechanical strength) in a single material system. This approach provides cost-effective manufacturing by eliminating the need for expensive materials like Nomex™ paper while maintaining or enhancing performance through the synergistic combination of polymer matrix and functional additives.
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 proposed stator core solution enhances manufacturing ease and performance by providing improved heat resistance, thermal conductivity, and mechanical strength, while being cost-effective and easier to integrate into the stator core.
Implementation Method 1
The polymer composition exhibits a melt viscosity of about 300 Pa-s or less
Implementation Method 2
a deflection temperature under load of about 170° C. or more
Implementation Method 3
high thermal conductivity, which could improve manufacturing ease and the overall performance of the stator
Data Source
AI summary
A stator core containing a stator body from which extends a plurality of spaced apart slot segments between which intermediate slots are defined and an insulative member disposed within at least one of the intermediate slots is provided. The insulative member contains a polymer composition comprising a polymer matrix that includes a thermotropic liquid crystalline polymer. The polymer composition exhibits a melt viscosity of about 300 Pa-s or less and a deflection temperature under load of about 170° C. or more.