Laminated Stator Oil Passage With Offset Walls for Motor Cooling
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Solution Overview
Problem
Existing motor cooling devices struggle to improve cooling performance effectively, particularly in efficiently transferring heat from high-temperature areas within the motor.
Innovation Solution
The motor cooling device incorporates an oil passage with an offset collision wall formed by overlapping and shifting oil holes in the stator's steel plates, enhancing heat transfer through turbulence and increased contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an oil passage with constant shape is used, then the structure is simple, but the cooling performance is insufficient
Solution Approach 1:
The oil passage is segmented into multiple sections along the flow direction, with each section having a different cross-sectional shape. This segmentation allows the passage to adapt to varying thermal conditions at different locations, improving cooling efficiency without requiring a completely complex redesign of the entire system
Solution Approach 2:
Different sections of the oil passage are given different local geometries (circular, rectangular, annular) matched to the local thermal requirements. Areas with higher heat generation receive passages optimized for better heat transfer, while cooler areas use simpler geometries, achieving localized optimization of cooling performance
2Temperature
If the oil passage shape changes frequently, then the cooling performance improves, but the manufacturing complexity increases
Solution Approach 1:
A single type of steel plate with a standardized oil hole pattern is used throughout the stator assembly. The same steel plate design can be reused in different positions and orientations, and by combining multiple identical plates, the varied passage shapes are achieved without needing to manufacture multiple types of steel plates
Solution Approach 2:
The oil passage structure is formed by nesting multiple identical steel plates with offset oil holes. The oil holes in adjacent plates are positioned at different locations, creating the effect of varied passage shapes through the stack without requiring each plate to have a unique design
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 improves cooling performance with low-pressure loss, even at small flow rates, while reducing the complexity and cost of the device by minimizing the variety of steel plates required.
Implementation Method 1
an oil passage, provided in a stator formed by laminating a plurality of steel plates, serving as a conduit for a cooling oil
Implementation Method 2
cooling oil is introduced into a stator tooth
Implementation Method 3
the oil passage is formed by an offset collision wall formed by shifting the oil holes in a direction orthogonal to the laminating direction and overlapping the oil holes
Data Source
AI summary
A motor cooling device includes: an oil passage, provided in a stator formed by laminating a plurality of steel plates, serving as a conduit for a cooling oil. Further, the oil passage is formed by a plurality of oil holes, which are formed in the steel plates and are overlapping with each other in a laminating direction of the steel plates, and the oil passage is formed by an offset collision wall formed by shifting the oil holes in a direction orthogonal to the laminating direction and overlapping the oil holes.