Cooling Assembly for Electric Machine Stator Coil Heads
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Solution Overview
Problem
Conventional cooling assemblies for electric machines are ineffective in extracting heat from the curved heads of prewound coils, as they are not in direct contact with the stator laminations, leading to suboptimal heat management.
Innovation Solution
A cooling assembly comprising a generally cylindrical body that contacts the stator's inner surface and includes head-cooling elements with thermally conducting materials to enclose and cool the coil heads, enhancing heat transfer through a thermally conducting resin and optimized mounting configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling assemblies are used that only contact the stator laminations, then the structure is simple and easy to manufacture, but heat extraction from the coil heads is not optimal
Solution Approach 1:
The cooling assembly is segmented into distinct functional zones: a cooling body that contacts the stator laminations and separate head-cooling elements that contact the coil heads. This segmentation allows each component to be optimized for its specific cooling function, improving overall heat extraction efficiency while maintaining manufacturing simplicity through modular design.
Solution Approach 2:
Different regions of the cooling assembly are designed with different thermal properties and contact configurations. The cooling body provides distributed cooling across the stator laminations, while the head-cooling elements provide focused cooling at the coil head locations. This local differentiation of cooling quality addresses the specific thermal needs of different components, optimizing heat extraction from both the straight legs and curved heads of the coils.
2Temperature
If the coil heads are not in direct contact with the stator laminations, then the coil insertion and assembly is easier, but thermal contact between coil heads and stator is insufficient
Solution Approach 1:
The head-cooling elements serve as intermediary components between the coil heads and the cooling system. These elements are specifically designed to contact the curved heads of the coils and transfer heat to the cooling body, which in turn contacts the stator laminations. This intermediary structure enables effective thermal contact without requiring direct contact between coil heads and stator, preserving ease of coil insertion while achieving optimal thermal management.
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 effectively cools both the straight legs and curved heads of prewound coils, improving overall heat extraction efficiency by ensuring direct contact and conduction of heat from the coil heads to the stator, thereby enhancing the thermal management of electric machines.
Implementation Method 1
receive heat conducting material therein
Data Source
AI summary
A cooling assembly for the stator of an electric machine provided with coils including heads is described herein. The cooling assembly includes a generally cylindrical cooling body provided with opposite longitudinal ends and at least one head-cooling element mounted to one of the longitudinal end of the body; the head-cooling element being so configured as to enclose heads of the coils and to receive heat conducting material therein.