Stator Sleeve Radial-Axial Cooling Cavity Design
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Solution Overview
Problem
Electric machines, such as generators, face challenges in effectively managing heat generated by the stator windings due to resistive losses, which can lead to reduced efficiency and increased maintenance costs, particularly in high-power applications like aircraft systems.
Innovation Solution
A stator sleeve assembly with a thermally conductive design that includes a first cylindrical housing portion with an inner radial cavity and an outer radial cavity connected by radial passages, allowing for a coolant flow path that distributes heat away from the stator assembly through a second cylindrical housing portion, ensuring efficient heat removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional cooling system is used, then the structure is simple, but the cooling efficiency is insufficient and heat removal is ineffective
Solution Approach 1:
The cooling system is segmented into multiple functional zones: an inner radial cavity for direct stator core cooling, an outer radial cavity for secondary cooling, and axial passages for fluid distribution. This segmentation allows each zone to perform specialized cooling functions, improving overall heat removal efficiency while maintaining manageable structural complexity through modular design
Solution Approach 2:
The cooling system employs a nested cavity structure where the inner radial cavity is positioned within the outer radial cavity. The inner cavity provides direct thermal contact with the stator core for primary cooling, while the outer cavity serves as a secondary cooling chamber. This nested arrangement maximizes cooling surface area and thermal contact efficiency without proportionally increasing external dimensions or structural complexity
2Temperature
If coolant flow is increased to improve cooling, then heat removal improves, but pressure drop increases
Solution Approach 1:
The cooling system transitions from conventional one-dimensional linear cooling channels to a multi-dimensional radial-axial cavity network. Coolant flows radially through the inner cavity, transitions axially to the outer cavity, and continues through axial passages. This multi-dimensional flow path increases cooling surface area contact and heat transfer efficiency while distributing pressure drop across multiple flow directions and zones, reducing the pressure penalty associated with high flow rates
3Temperature
If cooling passages are added to improve heat removal, then cooling efficiency increases, but device complexity increases
Solution Approach 1:
The radial and axial passages serve multiple functions simultaneously: they distribute coolant uniformly across the stator core, provide structural support for the sleeve assembly, and create thermal barriers that manage heat flow paths. This multi-functionality reduces the need for separate dedicated cooling components, improving heat removal capability while limiting the increase in overall device complexity
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 solution enhances cooling efficiency, reduces maintenance costs, and extends the life of the stator assembly by providing uniform coolant distribution and minimizing pressure drop, thereby maintaining operational reliability in power generation systems.
Implementation Method 1
a first cylindrical housing portion defining an inner radial cavity in a thermally conductive confronting relationship with the stator core
Implementation Method 2
The inner radial cavity, the set of radial passages, the outer radial cavity, the axial fluid passages, and the third cavity define a fluid coolant flow path whereby coolant can be provided to the inner radial cavity to the third cavity
Data Source
AI summary
A stator sleeve assembly for an electric machine includes a first cylindrical housing portion defining an inner radial cavity defined by at least one circumferential wall and an outer radial cavity, and a set of radial passages fluidly connecting the inner radial cavity with the outer radial cavity, and a second cylindrical housing portion defining a third cavity, the second housing portion axially spaced from the first housing portion.