Rotating Electric Machine Cooling Liquid Collection Tanks
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Solution Overview
Problem
Conventional rotating electric machines face challenges in effectively cooling the lower parts of stator coils due to inadequate flow and increased temperature of cooling liquid, leading to insufficient heat dissipation.
Innovation Solution
The implementation of cooling liquid collection tanks positioned around the lower parts of stator coil ends to collect and reserve cooling liquid, ensuring the lower parts are immersed and effectively cooled, with features like top openings, drain holes, and guide members to manage liquid flow and overflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling liquid is supplied to the upper parts of coil ends, then the upper parts can be cooled, but the lower parts become insufficiently cooled due to temperature increase and inadequate flow
Solution Approach 1:
The cooling liquid collection tank collects cooling liquid that has flowed down from the upper parts of the coil ends before it is discharged. This preliminary collection allows the system to replenish the cooling liquid and maintain a supply of cooler liquid for continuous cooling of the lower parts, resolving the issue of temperature increase and insufficient cooling effectiveness.
2Ease of operation
If cooling liquid flows along the surfaces of coil ends, then it can reach lower parts, but the temperature of cooling liquid increases during flow
Solution Approach 1:
The cooling liquid collection tank acts as an intermediary between the upper and lower parts of the coil ends. It collects the cooling liquid that has flowed down, allowing the system to replenish and maintain a continuous supply of cooling liquid, thereby managing the temperature increase that occurs during flow along the coil end surfaces.
3Speed
If cooling liquid directly falls through gaps in coil ends, then it reaches lower parts quickly, but insufficient amount of cooling liquid is supplied
Solution Approach 1:
The cooling liquid collection tank preliminarily collects the cooling liquid that has fallen through the gaps in the coil ends. This collection mechanism ensures that even though the cooling liquid reaches the lower parts quickly, the system can replenish the supply and maintain an adequate quantity of cooling liquid for continuous 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 reliable and efficient cooling of the lower stator coil parts by maintaining a continuous flow of cooling liquid, replacing high-temperature liquid with low-temperature liquid and preventing rotor immersion, thus enhancing heat dissipation and preventing drag loss.
Implementation Method 1
the cooling liquid may flow from the upper parts to the lower parts of the coil ends 161 and 162 by gravity along the surfaces of the coil ends 161 and 162
Implementation Method 2
the temperature of the cooling liquid will be increased by heat conducted from the coil ends 161 and 162 to the cooling liquid during the flow of the cooling liquid along the first flow paths 101
Data Source
AI summary
A rotating electric machine includes a rotor, a stator, a cooling device and a pair of cooling liquid collection tanks. The stator includes an annular stator core and a stator coil. The stator core is disposed radially outside the rotor so as to surround the rotor. The stator coil is mounted on the stator core so that a pair of coil ends of the stator coil protrude axially outward respectively from opposite axial end faces of the stator core. The cooling device is configured to supply cooling liquid to vertically upper parts of the coil ends of the stator coil. Each of the cooling liquid collection tanks is arranged to surround a vertically lower part of a corresponding one of the coil ends so as to collect and temporarily reserve therein the cooling liquid moved from the upper part to the lower part of the corresponding coil end.