Stator Housing Cooling Line Design for Electrical Machines
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Solution Overview
Problem
Existing electrical machines for motor vehicles face challenges in effective cooling while maintaining low manufacturing costs and minimal maintenance, particularly in dissipating power losses in the stator housing.
Innovation Solution
An electric machine design featuring a stator housing with an integrated meandering cooling line composed of channels and deflection parts, allowing for efficient coolant flow paths and heat transfer, which can be manufactured through casting or cutting, and optionally includes a bearing cooling loop to cool the rotor shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a multi-layer structure is used to form the cooling line in the stator housing, then the cooling effectiveness is improved, but the manufacturing complexity and cost increase
Solution Approach 1:
The cooling line is integrated directly into the stator housing as a single unified structure rather than using separate multi-layer components. The casting process combines the stator housing and cooling line into one piece, eliminating the need for complex multi-layer assemblies while maintaining effective cooling pathways.
Solution Approach 2:
The stator housing structure serves dual purposes: it provides structural support and simultaneously forms the cooling line channels. The housing itself creates the coolant flow paths through its internal geometry, eliminating the need for separate cooling components and reducing overall system complexity.
2Manufacturing precision
If complex cutting processes are used to manufacture the cooling line, then the cooling path precision is improved, but the manufacturing cost and time increase
Solution Approach 1:
The cooling line channels are formed during the initial casting process of the stator housing rather than requiring subsequent complex cutting operations. The precise cooling paths are created in advance as integral part of the housing geometry, achieving both precision and manufacturing efficiency.
Solution Approach 2:
The manual or complex mechanical cutting process is replaced with a casting process that forms the cooling lines directly. This substitution of manufacturing methodology achieves the desired geometric precision through mold design rather than through complex cutting operations.
3Area of stationary object
If the cooling line is designed to nestle closely against stator surfaces, then the heat transfer area is improved, but the manufacturing complexity increases
Solution Approach 1:
The cooling line is merged with the stator housing structure itself, allowing the channels to follow the contours of the stator surfaces closely. This integration maximizes the heat transfer area by conforming to the stator geometry while avoiding the complexity of separate adaptive components.
Solution Approach 2:
The cooling line geometry parameters are optimized during the casting process to achieve close proximity to stator surfaces. By adjusting the channel dimensions and positions in the mold design, maximum heat transfer area is achieved without requiring complex post-manufacturing adjustments.
4Temperature
If deflection portions are designed to redirect coolant flow effectively, then the cooling efficiency is improved, but the energy consumption for coolant pump increases
Solution Approach 1:
The deflection portions in the cooling line use smooth curved transitions rather than sharp angles to redirect coolant flow. These curved passages reduce flow separation and turbulence, allowing more efficient coolant circulation with lower pump energy requirements while maintaining effective heat removal.
Solution Approach 2:
The geometry parameters of the deflection portions are optimized to balance flow redirection effectiveness with minimal pressure loss. By carefully designing the curvature radius and transition angles, the system achieves efficient cooling while minimizing the energy required to maintain coolant flow.
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 enables effective cooling with reduced energy consumption for coolant pumps, minimizing dead water zones and enhancing heat dissipation, thus maintaining low maintenance and cost-effectiveness.
Implementation Method 1
cool the stator housing in order to dissipate the power loss that occurs
Implementation Method 2
heat transfer between the coolant and the stator to be cooled
Data Source
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AI summary
The invention relates to an electrical machine, particularly for driving a vehicle, comprising a rotor having an axially extending rotor shaft, a stator surrounding the rotor and a stator housing that receives the stator and has an integrated cooling line, wherein said cooling line is formed by an alternating sequence of ducts extending axially or circumferentially and deflection portions connecting adjacent ducts in a meandering pattern.