Cylindrical Frame Cooling for Electric Drive
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Solution Overview
Problem
Existing cooling systems for electric drives, such as synchronous motors, face challenges in maintaining efficient heat transfer and reducing pressure drop while being difficult to produce and integrate effectively, especially with meander-shaped cooling ducts that cause significant complexity and inefficiency.
Innovation Solution
A cylindrical frame with integrated cooling, where coolant flows inversely through the frame's width, utilizing parallel bundles of cooling ducts around the circumference to maintain consistent coolant temperature and reduce pressure drop, allowing for efficient heat transfer and simplified production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If meander-shaped cooling ducts are used to cool the electric drive, then the cooling effect is evenly distributed across the entire length, but the pressure drop increases considerably and production becomes very difficult
Solution Approach 1:
Instead of using meander-shaped ducts that change direction multiple times, the patent inverts the approach by using straight parallel ducts that run directly from intake to outlet, eliminating the need for complex directional changes while achieving effective cooling through the inverse flow path
2Temperature
If meander-shaped cooling ducts are used to cool the electric drive, then the cooling effect is evenly distributed across the entire length, but the pressure drop increases considerably
Solution Approach 1:
The patent inverts the conventional meander-shaped duct design by implementing straight parallel ducts that run directly from coolant intake to outlet, eliminating frequent directional changes. This inversion reduces flow path length and resistance, thereby significantly decreasing pressure drop and energy loss while maintaining effective cooling distribution
3Temperature
If cooling ducts are placed between the teeth of the iron core, then the drive can be cooled, but the filling factor of the interspaces of the teeth is reduced
Solution Approach 1:
The patent extracts the cooling ducts from the tooth interspaces of the iron core and relocates them to the frame structure surrounding the iron core. This extraction allows cooling functionality to be maintained while preserving the full filling factor of the tooth interspaces for coil windings
4Loss of energy
If parallel bundles of cooling ducts are used, then the pressure drop is kept low and heat transfer efficiency rises, but the frame structure becomes more complex
Solution Approach 1:
The patent segments the cooling system into multiple parallel bundles of ducts within the frame structure. This segmentation allows coolant to flow through multiple parallel paths simultaneously, reducing pressure drop and increasing heat transfer efficiency while distributing the structural complexity across modular segments
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
The solution achieves uniform cooling with reduced energy expenditure, maintaining consistent coolant temperature across the frame, minimizing pressure drop, and simplifying production by using straight paths for coolant ducts, enhancing heat transfer efficiency and ease of assembly.
Implementation Method 1
coolant inversely traverses a width of the frame... guides the coolant from a coolant intake substantially around the entire circumference of the frame... guides the coolant virtually around the entire circumference of the frame, back to a coolant outlet
Data Source
AI summary
In a frame having integrated cooling for an electric drive, coolant flows through a width of the frame in an inverse manner. The frame has roughly the form of a cylinder sleeve having a diameter and an axial width, whose outer surface is provided with cooling ducts. A first bundle of cooling ducts, connected in parallel, guides the coolant from a coolant intake around substantially the entire circumference of the frame. A second bundle of cooling ducts, connected in parallel, guides the coolant around substantially the entire circumference of the frame, back to a coolant outlet (8).