Integrated Stator Cooling Flow Path for Direct Coil Cooling
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Solution Overview
Problem
Existing motor designs require a separate cooling guide structure on the outer circumferential surface, which increases volume, assembly complexity, and economic costs, while traditional internal cooling paths do not effectively cool the coil without additional components.
Innovation Solution
A stator with an integrated cooling flow path inside the core, featuring inlets and outlets on the outer surface and a partitioned flow path that directs cooling fluid directly to the coil, eliminating the need for a separate cooling guide and reducing the motor's size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a separate cooling guide structure is added on the outer circumferential surface to spray cooling fluid to the coil, then cooling efficiency is improved, but device complexity and volume increase
Solution Approach 1:
The cooling guide structure is merged with the stator core by integrating the cooling fluid outlet directly into the core structure. The cooling flow path is formed within the core itself, eliminating the need for separate cooling guide components while maintaining the function of directing cooling fluid to the coil.
Solution Approach 2:
The stator core is given multiple functions: it serves both as the magnetic circuit component and as the cooling fluid delivery system. The core structure incorporates the cooling flow path and outlet, allowing it to perform both magnetic and thermal management functions simultaneously.
2Temperature
If a separate cooling guide structure is used to direct cooling fluid to the coil, then cooling efficiency is improved, but assembly complexity and manufacturing cost increase
Solution Approach 1:
The cooling guide function is combined with the stator core manufacturing process. The cooling flow path is formed as an integral part of the core structure, eliminating separate assembly steps for installing cooling guides and reducing manufacturing complexity.
3Temperature
If the cooling flow path is disposed on the outer circumferential surface of the core, then cooling efficiency is improved, but motor volume increases
Solution Approach 1:
The cooling flow path is nested within the stator core structure itself. The cooling channels are positioned inside the core, utilizing the existing core volume rather than adding external cooling structures, thereby maintaining compact motor dimensions.
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 assemblability, reduces motor size and cost, and improves cooling efficiency by directly spraying cooling fluid to the coil, while maintaining a simple structure.
Implementation Method 1
a cooling flow path disposed inside the core, wherein at least one inlet of cooling fluid is disposed along an outer circumferential surface of the core, and at least one outlet of cooling fluid connected to the at least one cooling fluid inlet
Implementation Method 2
the cooling fluid discharged through the cooling fluid outlet is directly sprayed to the coil to contact the coil to directly cool the coil
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A stator comprises: a core including an annular yoke, teeth extending inwardly from the yoke and radially disposed, and a shoe disposed at an end of each tooth, and a cooling flow path disposed inside the core, at least one cooling fluid inlet is disposed along an outer circumferential surface of the core, and at least one cooling fluid outlet connected to the at least one cooling fluid inlet is disposed in the yoke or the teeth in an upper surface of the core.