Motor Oil Cooling Guides for Winding Coil Thermal Management
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Solution Overview
Problem
Existing electrical machine cooling systems suffer from inefficient cooling of winding coils due to oil loss along the circumferential wall and casing end cover caused by surface tension, leading to poor thermal durability.
Innovation Solution
The implementation of oil-guides between the oil outlet holes and winding coils, which guide the cooling oil to pour directly onto the coils, preventing oil loss and ensuring even cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling oil flows through oil passages with 90-degree corners to cool winding coils, then the cooling oil can reach the coils, but the cooling oil loses pressure and cannot be sprayed onto the coils effectively
Solution Approach 1:
The patent divides the cooling system into separate functional components: oil passages for pressure delivery and oil-guides for spray distribution. This segmentation allows the oil passages to maintain pressure without numerous 90-degree corners, while the oil-guides handle the spraying function, resolving the contradiction between pressure maintenance and effective cooling delivery.
Solution Approach 2:
The oil-guide acts as an intermediary component between the oil passage outlet and the winding coils. It receives pressurized oil from the passage and redirects it to spray onto the coils, mediating between the pressure source and the cooling target to achieve effective spray cooling without pressure loss in the passages.
2Ease of operation
If cooling oil flows out of oil outlet holes located at certain angles, then the oil can exit the passages, but the oil flows along the circumferential wall due to surface tension instead of spraying onto the coils
Solution Approach 1:
The oil-guide serves as an intermediary that intercepts the cooling oil exiting the oil outlet hole and redirects it toward the winding coils. This prevents the oil from following the circumferential wall path caused by surface tension, ensuring the oil is properly directed to its cooling target without loss.
Solution Approach 2:
The oil-guide is positioned at a specific location and angle to provide localized direction control for the cooling oil. By creating a localized flow path that overrides the general surface tension effect along the circumferential wall, the system achieves proper oil direction where needed while maintaining simplicity elsewhere.
3Temperature
If grooves are provided below the winding coils to accumulate cooling oil, then the coils can be cooled by immersion, but it is difficult to mount and manufacture while risking coil insulation damage
Solution Approach 1:
The oil-guide acts as an intermediary that delivers cooling oil directly to the winding coils through a controlled spray path, eliminating the need for grooves below the coils. This intermediary approach achieves effective cooling without the manufacturing and mounting complexities associated with groove installation near the coils.
Solution Approach 2:
The patent extracts the cooling function from the groove structure and relocates it to the oil-guide component. By taking out the need for grooves and implementing cooling delivery through the oil-guide spray mechanism, the system achieves effective cooling while avoiding the manufacturing and insulation risks associated with groove installation.
4Adaptability or versatility
If cooling oil flows along circumferential grooves to cool multiple winding coils, then multiple coils can be cooled, but the cooling is uneven across different coils
Solution Approach 1:
The patent segments the cooling delivery function by providing multiple separate oil-guides, each targeting specific winding coils. This segmentation allows each coil or group of coils to receive dedicated cooling oil flow, achieving uniform cooling across multiple coils without relying on oil flowing along circumferential grooves, which causes uneven distribution.
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 solution enhances the cooling efficiency of the winding coils, thereby improving the thermal durability of the electrical machine by ensuring that the cooling oil is directed onto the coils instead of being lost, resulting in more effective heat dissipation.
Implementation Method 1
causing the cooling oil to lose pressure. Thus, the cooling oil will not be sprayed onto the winding coils from the oil outlet hole but naturally flow out by gravity... the oil when flowing out of the oil outlet hole may flow along the circumferential wall of the housing and the casing end cover due to the surface tension of the oil
Implementation Method 2
In the prior art, winding coils in the electrical machine are cooled with cooling oil... enhances the cooling efficiency of the winding coils, thereby improving the thermal durability of the electrical machine by ensuring that the cooling oil is directed onto the coils instead of being lost, resulting in more effective heat dissipation
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An electrical machine comprises a casing (1), an oil inlet hole (7), an oil passage (2), oil outlet holes (3), a stator retainer (8), a casing end cover (10), a stator iron core (5), winding coils (6), slot insulations (12) and oil-guides (4). The oil passage (2) is located inside the casing (1) and links with the oil inlet hole (7) of the casing (1) and the oil outlet holes (3) of the stator retainer (8). The oil outlet holes (3) are located above the winding coils (6) and the oil-guides (4) are located between the oil outlet holes (3) and the winding coils (6). Oil entering from the oil inlet hole (7) pours onto the winding coils (6) by the guidance of the oil-guides (4) after flowing through the oil passage (2) and flowing out of the oil outlet holes (3). The winding coils of the electrical machine can be effectively cooled and the electrical machine can achieve higher thermal durability. An oil cooling method for the electrical machine is also provided.