Split Stator Oil Cooling Structure for Direct Coil-Side Cooling
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Solution Overview
Problem
Existing motor oil-cooling structures for coils wound around split stator cores are inefficient due to misaligned injection holes that fail to effectively cool the coils, allowing oil to bypass them, and require complex water cooling systems.
Innovation Solution
The structure employs injection holes angled at a circumferential and radial inclination to directly target coil gaps, ensuring oil hits and cools the coil sides, using lubricating oil pressure from a transmission unit, thus simplifying the cooling system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If injection holes are arranged to face coil gaps in axial direction, then the structure is simple, but cooling performance deteriorates because oil passes through gaps without hitting coils
Solution Approach 1:
The injection holes are inclined at a specific angle (e.g., 10-20 degrees) relative to the axial direction, changing the parameter of injection direction to make oil hit the coil sides effectively while maintaining structural simplicity
Solution Approach 2:
The injection holes are positioned to target specific regions (coil sides) rather than uniformly cooling all areas, creating localized high-effect cooling zones where heat generation is most intense
2Ease of manufacture
If injection holes are misaligned with coil gaps, then manufacturing is easier, but cooling effectiveness deteriorates due to oil bypassing coils
Solution Approach 1:
By defining a specific inclination angle range for injection holes, the patent provides a manufacturing tolerance window that accommodates alignment variations while ensuring reliable cooling performance is maintained
3Device complexity
If conventional axial injection is used, then system complexity is low, but cooling performance is insufficient requiring additional water cooling systems
Solution Approach 1:
Changing the injection angle parameter allows a single oil cooling system to achieve cooling efficiency previously requiring complex multi-system approaches, eliminating the need for separate water cooling systems
Solution Approach 2:
The lubricating oil performs dual functions: lubrication and cooling, by optimizing its injection trajectory to directly cool coils, eliminating the need for dedicated cooling systems
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 configuration enhances cooling performance by directly targeting coil sides, reduces system complexity, and optimizes space efficiency, while using existing lubricating oil pressure.
Implementation Method 1
oil injected toward coil gaps hits against side faces of coils directly and obliquely, and passes through coil gaps while drawing heat from coils
Data Source
AI summary
A motor oil-cooling structure for cooling, with oil, coils wound around split stator cores of a motor includes injection holes arranged in a circumferential direction of the split stator cores. The motor includes a motor case, a rotor rotatably supported by the motor case, and a stator including the split stator cores fixed to the motor case and arranged along a cylindrical outer periphery of the rotor. Each of the injection holes is structured to inject oil toward a corresponding one of coil gaps each of which is formed between two of the split stator cores adjacent to each other. Furthermore, each of the injection holes is structured to inject oil in a direction inclined by a circumferential inclination angle with respect to a direction of a motor axis, wherein oil injected to the coil gaps in the direction of the motor axis passes straight through the coil gaps.