Stator Winding Cooling Liquid Distribution in Electric Rotating Machines
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Solution Overview
Problem
The use of liquid coolant in electric rotating machines results in insufficient cooling performance due to a large portion of the liquid passing through interphase crossover portions, preventing uniform distribution over the stator winding.
Innovation Solution
The electric rotating machine incorporates a cooling liquid feeding system that applies liquid coolant to overlapping crossover portions of the stator winding, using a pipe with a discharge opening to direct the coolant radially outward and ensure comprehensive coverage, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid coolant is used instead of cooling air, then cooling efficiency should be improved, but the liquid passes through interphase crossover portions and does not spread uniformly over the stator winding, resulting in insufficient cooling performance
Solution Approach 1:
The invention segments the cooling liquid supply by providing multiple discharge openings at different radial positions and multiple blowout openings at different axial positions. This segmentation allows the cooling liquid to be delivered to different regions (crossover portions and coil ends) separately, ensuring uniform distribution across the entire stator winding surface and preventing the liquid from simply passing through undistributed.
Solution Approach 2:
The invention introduces an intermediary structure (the housing with integrated discharge and blowout openings) that mediates between the cooling liquid source and the stator winding. This intermediary controls the liquid flow direction and distribution, directing it to both the crossover portions and coil ends systematically, thereby solving the non-uniform distribution problem.
2Temperature
If cooling liquid is applied to crossover portions, then cooling of stator winding should be improved, but the liquid flow path becomes complex and cooling coverage may be reduced
Solution Approach 1:
The invention merges the cooling liquid feeding function directly into the housing structure. The housing integrates both the discharge opening (for supplying liquid to crossover portions) and the blowout opening (for supplying liquid to coil ends), combining multiple cooling functions into a single structural element, thereby reducing overall device complexity while achieving comprehensive cooling coverage.
Solution Approach 2:
The housing serves multiple functions: it contains the stator winding, provides structural support, and acts as the cooling liquid distribution system through its integrated discharge and blowout openings. This multi-functionality eliminates the need for separate cooling liquid delivery mechanisms, simplifying the overall device structure while maintaining effective cooling.
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 ensures excellent cooling performance by ensuring uniform distribution of the coolant over the stator winding, improving the machine's overall cooling efficiency.
Implementation Method 1
a cooling liquid feeding function of applying cooling liquid to the coil end
Implementation Method 2
the cooling liquid feeding function applying the cooling liquid to at least one of the crossover portions
Data Source
AI summary
The electric rotating machine includes a rotor, a stator having a stator core and a stator winding wound on the stator core, and a cooling liquid feeding function of applying cooling liquid to the coil end of the stator winding. The stator winding constituted by coils wound along the circumferential direction includes crossover portions each of which electrically connects the ends of two of the coils through which currents in the same phase flow, respectively. The crossover portions are arranged so as to overlap one another only partially in the circumferential direction. The cooling liquid feeding function applies the cooling liquid to at least one of the crossover portions.