Rotating Electrical Machine Cooling Through-Holes
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Solution Overview
Problem
Existing rotating electrical machines face challenges in uniformly cooling coil end portions due to varying heat dissipation capabilities, with proximal parts effectively cooling through the stator core while distal parts tend to overheat, and liquid refrigerants struggle to address this non-uniform cooling.
Innovation Solution
Incorporating multiple types of cooling through-holes with different flow capacities within the coil end portions to allow varying amounts of liquid refrigerant flow, arranged according to temperature increase characteristics to ensure uniform cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a single type of cooling through-hole is used in the coil end portion, then the structure is simple, but the cooling performance is non-uniform with distal parts overheating
Solution Approach 1:
The patent applies local quality by providing different types of cooling through-holes at different locations within the coil end portion. Specifically, first cooling through-holes with different diameters are provided at different radial positions, and second cooling through-holes are provided at different axial positions. This allows each region of the coil end portion to receive appropriate cooling based on its local heat generation characteristics, achieving uniform cooling across the entire coil end portion while avoiding the overheating of distal parts.
2Temperature
If cooling through-holes are added to improve cooling performance, then temperature control improves, but the manufacturing complexity increases
Solution Approach 1:
The patent segments the cooling through-holes into different types based on their locations and functions. First cooling through-holes are segmented by diameter (different radial positions), and second cooling through-holes are segmented by axial position. This segmentation allows each type of through-hole to be optimized for its specific location's cooling needs, improving overall temperature control while maintaining a systematic approach to manufacturing.
3Temperature
If liquid refrigerant flow is increased to cool distal parts, then cooling of distal parts improves, but excessive refrigerant flow causes inefficiency
Solution Approach 1:
The patent changes the parameters of the cooling through-holes by providing different diameters for first cooling through-holes at different radial positions. This parameter variation allows the refrigerant flow rate to be optimized for each location - larger diameters where more cooling is needed (distal parts) and smaller diameters where less cooling is required, achieving efficient cooling without excessive refrigerant consumption.
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 allows for appropriate delivery of liquid refrigerant to each part of the coil end portion, effectively cooling the entire area and improving cooling performance by addressing the non-uniform heat dissipation issues.
Implementation Method 1
a plurality of cooling through-holes (112, 113, and 114) passing through the coil end portions (111f and 111g) in a radial direction and having different capacities that allow different amounts of liquid refrigerant to flow
Data Source
AI summary
A motor generator includes three types of cooling through-holes. The cooling through-holes are three types of holes passing through the coil end portions in the radial direction and having different flow capacities that allow different amounts of liquid refrigerant to flow. Holes with larger flow capacities allow larger amounts of liquid refrigerant to flow therethrough. In the motor generator, the three types of cooling through-holes are arranged as appropriate according to the temperature increase characteristics of the coil end portions. Consequently, in the motor generator, an appropriate amount of liquid refrigerant can be delivered to each part of the coil end portions according to the difference in temperature increase rate.