External Stator Tooth Groups With Thermal Interlayers for Heat Dissipation
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Solution Overview
Problem
Existing rotating-field machines face challenges in efficiently dissipating heat from windings and reducing the weight of external stators, which limits their continuous power and efficiency, especially in applications like electric aircraft where power density and cost-effectiveness are critical.
Innovation Solution
The introduction of intermediate elements made from a second material with lower density and higher heat conductivity than the pole cores, arranged between stator tooth groups, facilitates efficient heat dissipation and weight reduction by allowing for axial and radial heat conduction, potentially using materials like aluminum or ceramics, and incorporating cooling arrangements such as water-type cooling or heatpipes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the external stator is manufactured entirely from a first material (e.g., ferromagnetic material) with high saturation and low losses, then the magnetic circuit performance is improved, but the weight of the external stator increases and heat dissipation capability deteriorates
Solution Approach 1:
The external stator is segmented into different material regions: tooth groups made from a first material (ferromagnetic) for magnetic circuit functionality, and intermediate elements made from a second material (e.g., aluminum, magnesium, or plastic) for weight reduction and heat dissipation. This segmentation allows each region to be optimized for its specific function.
Solution Approach 2:
Different materials with different properties are applied to different locations of the external stator. The tooth groups use high-saturation ferromagnetic material for magnetic performance, while the intermediate elements use lightweight, high-heat-conductivity materials for weight reduction and thermal management, achieving local optimization of properties.
2Reliability
If the external stator is manufactured entirely from a first material (e.g., ferromagnetic material) with high saturation and low losses, then the magnetic circuit performance is improved, but the heat dissipation capability deteriorates
Solution Approach 1:
The external stator is segmented into different material regions: tooth groups made from a first material (ferromagnetic) for magnetic circuit functionality, and intermediate elements made from a second material (e.g., aluminum, magnesium, or plastic) for weight reduction and heat dissipation. This segmentation allows each region to be optimized for its specific function.
Solution Approach 2:
Different materials with different properties are applied to different locations of the external stator. The tooth groups use high-saturation ferromagnetic material for magnetic performance, while the intermediate elements use lightweight, high-heat-conductivity materials for weight reduction and thermal management, achieving local optimization of properties.
Solution Approach 3:
The intermediate elements act as thermal mediators between the tooth groups and the environment. They facilitate heat transfer from the tooth groups (where heat is generated) to the environment, improving overall heat dissipation capability while not interfering with the magnetic circuit function of the tooth groups.
3Weight of moving object
If intermediate elements made from a second material are introduced between stator tooth groups, then heat dissipation and weight reduction are improved, but the magnetic circuit continuity may be affected
Solution Approach 1:
The external stator is segmented into different material regions: tooth groups made from a first material (ferromagnetic) for magnetic circuit functionality, and intermediate elements made from a second material (e.g., aluminum, magnesium, or plastic) for weight reduction and heat dissipation. This segmentation allows each region to be optimized for its specific function.
Solution Approach 2:
The intermediate elements act as thermal mediators between the tooth groups and the environment. They facilitate heat transfer from the tooth groups (where heat is generated) to the environment, improving overall heat dissipation capability while not interfering with the magnetic circuit function of the tooth groups.
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
This configuration enhances heat dissipation by a factor of 1.5-2 and reduces stator weight, thereby increasing continuous power and power density, while minimizing material costs and optimizing copper filling ratios, making it suitable for high-efficiency and lightweight electric motors.
Implementation Method 1
facilitates efficient heat dissipation and weight reduction by allowing for axial and radial heat conduction
Implementation Method 2
incorporating cooling arrangements such as water-type cooling or heatpipes
Implementation Method 3
incorporating cooling arrangements such as water-type cooling or heatpipes
Data Source
AI summary
The invention relates to an external stator of a rotating-field machine with internal rotor, which external stator is designed as an internal stator or external stator and which external stator has a number of N stator teeth which together form a number of N/2 tooth groups, and each stator tooth has in each case one pole core and one pole shoe integrally formed thereon, wherein the pole cores are manufactured from a first material, and that in each case one tooth group is formed by two directly adjacently arranged stator teeth which, together with a magnetic return means, are constituent parts of a magnetic circuit, characterized in that, between two adjacent stator teeth of two adjacent tooth groups, there is arranged in each case at least one intermediate element which extends in particular in an axial direction of the stator and which is manufactured from a second material, and in that differs from the first material of the pole cores.