Permanent Magnet Machine Stator with Direct Liquid Cooling
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Solution Overview
Problem
Current cooling methods for permanent magnet machines are inefficient and bulky, particularly in addressing heat generated at the end turns of windings and within the stator body, due to the use of large and complex fluid-cooled systems.
Innovation Solution
A compact stator assembly with integrated cooling channels or fins and nozzles that spray cooling fluid onto the winding end-turns, allowing for efficient heat transfer through conduction and forced convection, and optionally forming longitudinal fins for further heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fluid-cooled cooling assembly and housing are used, then cooling function is provided, but the system becomes large, inefficient, and requires complicated fixturing
Solution Approach 1:
The cooling channels are integrated directly into the stator body structure, merging the cooling system with the stator assembly. This eliminates the need for separate cooling housings and complicated fixturing, reducing device complexity while maintaining cooling efficiency through direct thermal contact between windings and cooling fluid
Solution Approach 2:
Cooling fluid serves as an intermediary medium that directly contacts both the stator body and winding end-turns. The fluid transfers heat from high-temperature regions (end-turns) through the stator body to designated exit points, providing efficient heat removal without requiring complex mechanical cooling assemblies
2Reliability
If traditional cooling assembly is used, then cooling function is achieved, but the system requires large volume and weight
Solution Approach 1:
The cooling channels are formed as integral parts of the stator body, combining the structural support function with the thermal management function. This integration eliminates the need for separate cooling housings and reduces overall system volume while maintaining effective cooling of both the stator body and winding end-turns
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 provides a more efficient and compact cooling system that effectively transfers heat from the windings to the cooling fluid, improving thermal management in permanent magnet machines while reducing weight and volume.
Implementation Method 1
efficient heat transfer through conduction and forced convection
Implementation Method 2
efficient heat transfer through conduction and forced convection
Data Source
AI summary
A permanent magnetic machine includes a stator body having a first end, a second end, and a plurality of generally radial slots formed therein for accepting a set of windings having a first set of end-turns at the first end and a second set of end-turns at the second end. The stator body has a plurality of channels adjacent to the slots and extending from the first end of the stator body to the second end of the stator body, wherein the channels are configured to allow the flow of a cooling fluid therethrough. A plurality of nozzles in fluid communication with the plurality of channels are configured to spray the cooling fluid onto the first and second set of end turns.