Stator Coil Oil Cooling Layout for Uniform Flow Distribution
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Solution Overview
Problem
Existing cooling systems for electric motor stators using oil as a coolant fluid fail to provide uniform cooling and are prone to high pressure losses due to non-uniform oil circulation, leading to uneven heat distribution and inefficiency.
Innovation Solution
A stator design with an oil inlet manifold and outlet manifold, where each coil is associated with at least one inlet orifice, and the oil flow is divided into two parallel flows through gaps between adjacent coils, ensuring simultaneous and uniform cooling of all coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single oil inlet manifold is used to cool multiple coils in series, then the device complexity is reduced, but the cooling uniformity deteriorates because oil temperature increases progressively along the flow path
Solution Approach 1:
The single inlet manifold is segmented into multiple independent inlet orifices, each serving a specific coil. This segmentation allows parallel cooling paths, preventing progressive temperature increase and ensuring uniform cooling across all coils while maintaining relatively simple overall structure
2Device complexity
If oil circulates through all coils in series, then the device complexity is minimized, but the pressure losses increase due to numerous regular head losses
Solution Approach 1:
The series oil circulation path is segmented into multiple parallel paths through individual inlet orifices for each coil. This reduces the cumulative head losses by eliminating progressive pressure drops across multiple coils in series, while maintaining a simple overall circuit configuration with single inlet and outlet manifolds
3Productivity
If oil flow rate is increased to improve cooling capacity, then the cooling efficiency improves, but the pressure losses increase making leakproofing more difficult
Solution Approach 1:
The total oil flow is segmented into multiple parallel streams through individual inlet orifices. This allows the system to achieve high total cooling capacity through increased flow rate while maintaining lower pressure losses compared to a single high-flow path, because the parallel configuration reduces cumulative head losses and improves overall flow efficiency
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 design achieves uniform cooling of all coils by minimizing flow resistance and pressure losses, maintaining consistent oil temperature and enhancing cooling efficiency.
Implementation Method 1
a circulation of coolant fluid in a circuit machined into the housing of the electric motor or a circulation of oil at the level of the winding overhangs
Implementation Method 2
The cooling system comprises an oil inlet manifold and an oil outlet manifold, the inlet manifold being pierced by inlet orifices to send the oil over the coils
Data Source
AI summary
The invention relates to a stator of an electric motor stator equipped with coils (3, 3a, 3b) and comprising an oil cooling system for the coils. The coils (3, 3a, 3b) are arranged leaving a gap (15) between them and defining inside and outside circumferences. The system comprises oil inlet and outlet manifolds pierced by orifices to send or recover oil to or from the coils. Each inlet orifice (10) is associated with a respective coil (3, 3a, 3b), one of the manifolds surrounding the inside circumference while the other manifold surrounds the outside circumference, a flow of oil exiting each inlet orifice (19) circulating mostly in the gap (15) between its associated coil (3) and at least one of the two adjacent coils (3a, 3b) and then exiting via an outlet orifice.