Integrated Stator Cooling Channels for Compact Electric Machines
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Solution Overview
Problem
Existing stator cooling technologies for electric machines are inefficient and require significant installation space, limiting the performance and efficiency of the electric machine.
Innovation Solution
A stator design with integrated cooling channels between the yoke and stator winding, and between the stator winding and pole teeth, utilizing a cooling medium to enhance cooling efficiency while reducing installation space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external-side cooling of the stator is implemented using a cooling channel between the stator and housing, then cooling efficiency is improved, but installation space requirements increase
Solution Approach 1:
The cooling channel is nested within the stator structure itself, specifically in the circumferential groove of the yoke, rather than being implemented as an external channel between the stator and housing. This nesting approach integrates the cooling function into the existing stator volume, improving cooling efficiency without increasing installation space requirements
Solution Approach 2:
The cooling channel is arranged in the circumferential direction within the yoke's groove, utilizing the circumferential space that would otherwise be unused. This dimensional reorganization allows the cooling medium to flow through the stator structure without requiring additional radial or axial space, thereby maintaining compact installation footprint while achieving effective cooling
2Temperature
If end-face winding heads are cooled by ambient air in the radial direction, then cooling is provided, but cooling efficiency is insufficient
Solution Approach 1:
The invention extracts the cooling function from the insufficient ambient air cooling system and implements a dedicated liquid cooling channel within the stator yoke. This separate cooling pathway directly contacts the stator winding and core, providing significantly enhanced cooling efficiency compared to passive ambient air cooling of the winding heads alone
Solution Approach 2:
A liquid cooling medium is introduced as an intermediary substance to transfer heat away from the stator winding and core. The cooling medium flows through the circumferential groove in the yoke, providing efficient heat removal that mediates between the heat-generating stator components and the external environment, achieving superior cooling performance
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 integrated cooling channels provide efficient cooling, improving the performance of the electric machine and reducing its installation space requirements.
Implementation Method 1
the first cooling channel rests at least in portions directly against a wall defining the recess and/or in portions directly against the stator winding, and/or a second cooling channel through which a cooling medium may flow, wherein the second cooling channel rests at least in portions directly against the stator winding and/or against the pole shoe
Data Source
AI summary
A stator for an electric machine of a motor vehicle, having an annular yoke, with an inner side directed inwards in the radial direction of the yoke, wherein a plurality of pole teeth are connected by form fit to the yoke on the inner side of the yoke, a stator winding which is formed as a mat and which is arranged between the pole teeth, a first cooling channel through which a cooling medium may flow and which extends in the longitudinal direction of the stator, wherein the first cooling channel is arranged in a recess, and a second cooling channel through which a cooling medium may flow, wherein the second cooling channel is arranged between two adjacent pole teeth between an inner side of the stator winding directed inwards in the radial direction of the stator and a pole shoe of the pole tooth.