Stator Cooling Structure for Uniform Oil Flow Through Windings and Core
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Solution Overview
Problem
Existing electric motor stator cooling methods, particularly oil-immersion cooling, fail to provide uniform heat exchange across the entire stator assembly, limiting overall cooling effectiveness.
Innovation Solution
A stator cooling structure with first and second sealing oil covers enclosing opposite ends of the stator winding, forming cavity structures and a cooling-oil channel within the stator core, allowing cooling oil to flow through and around the stator assembly for uniform heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If oil-immersion cooling is used to cool the stator windings, then the cooling effect on the stator windings is improved, but the heat exchange uniformity across the entire stator assembly deteriorates
Solution Approach 1:
The stator assembly is segmented into three distinct cooling zones: the first cavity structure at one end, the second cavity structure at the other end, and the cooling-oil channel running through the stator core. Each zone independently contacts cooling oil, ensuring uniform heat exchange across the entire stator assembly rather than concentrating cooling at specific locations.
Solution Approach 2:
The cooling oil acts as an intermediary substance that mediates heat transfer between different parts of the stator assembly. By introducing cooling oil into the cavities and channel, thermal energy is efficiently conducted from the stator windings and core to the cooling oil, achieving uniform cooling across all components.
2Device complexity
If cooling oil flows only through external cavities, then the cooling structure is simple, but the heat exchange efficiency with the stator core deteriorates
Solution Approach 1:
The cooling-oil channel is nested within the stator core structure itself, with the channel running through the interior of the core. This nested arrangement allows cooling oil to directly contact the stator core from the inside, significantly improving heat exchange efficiency while maintaining relatively simple overall structure.
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
Enables effective and uniform cooling of the entire stator assembly by ensuring all parts of the stator come into contact with cooling oil, enhancing thermal dissipation efficiency.
Implementation Method 1
the cooling oil can flow into the first cavity structure from the oil intake hole, then the cooling oil flows into the stator core through the cooling-oil channel, and the cooling oil can flow into the second cavity structure along the cooling-oil channel so that the cooling oil can flow out from the oil output hole after passing through the first end of the stator winding, the stator core and the tail end of the stator winding successively, thereby enabling the whole stator assembly to contact the cooling oil
Implementation Method 2
the first sealing oil cover and one end face of a stator core enclose a first cavity structure, which is in communication with the oil intake hole, and the second sealing oil cover and the other end face of the stator core encloses a second cavity structure, which is in communication with the oil output hole; and a cooling-oil channel is provided inside the stator core, and is in communication with the first cavity structure and the second cavity structure
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Provided in the present invention are an electric-motor stator cooling structure and an electric motor. The electric-motor stator cooling structure comprises a first sealing oil cover and a second sealing oil cover, wherein the first sealing oil cover is provided with an oil intake hole; the second sealing oil cover is provided with an oil output hole; the first sealing oil cover and the second sealing oil cover are respectively used for covering two opposite ends of a stator winding, such that the first sealing oil cover and one end face of a stator core enclose a first cavity structure, which is in communication with the oil intake hole, and the second sealing oil cover and the other end face of the stator core enclose a second cavity structure, which is in communication with the oil output hole; and a cooling-oil channel is provided inside the stator core, and is in communication with the first cavity structure and the second cavity structure. Cooling oil can sequentially pass through a head end of the stator winding, the stator core and a tail end of the stator winding, and then flows out through the oil output hole, such that an entire stator assembly can be uniformly cooled.