Asymmetric Cooling Structure for Rotary Electric Machine
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Solution Overview
Problem
Conventional cooling structures for rotary electric machines suffer from pressure drops due to long cooling paths, leading to decreased fluid velocity and reduced cooling efficiency, which affects heat dissipation and machine accuracy.
Innovation Solution
A cooling structure with asymmetric first and second division regions forming an interlaced path, featuring a sleeve with dividers, first and second walls, and a jacket with an inlet and outlet, where the number of channels decreases from the inlet to the outlet, enhancing fluid velocity and thermal convection coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a continuous spiral channel is used for cooling, then the cooling path is formed, but the pressure drop occurs and fluid velocity decreases from inlet to outlet
Solution Approach 1:
The continuous spiral channel is divided into multiple segments by dividing walls, creating a series of divided regions. Each region contains multiple channels that are interconnected, forming an interlaced cooling path. This segmentation allows the cooling liquid to switch between different channel groups, reducing the cumulative pressure drop while maintaining effective heat dissipation throughout the stator.
Solution Approach 2:
Adjacent divided regions are connected through communication holes in the dividing walls, merging the channel networks of different regions. This creates an interlaced path where cooling liquid can flow through multiple channels in sequence, effectively combining the cooling benefits of multiple parallel paths while reducing pressure drop compared to a single long spiral channel.
2Area of stationary object
If the cooling path is extended to cover more area, then heat dissipation coverage is improved, but fluid velocity decreases due to pressure drop
Solution Approach 1:
The stator cooling surface is divided into multiple divided regions, each containing several channels. This segmentation allows the cooling liquid to be distributed across multiple parallel channel groups, maintaining higher fluid velocity in each channel while collectively covering a larger area of the stator for effective heat dissipation.
Solution Approach 2:
The cooling liquid flow path transitions from a single two-dimensional spiral trajectory to a three-dimensional interlaced network through vertical communication holes in the dividing walls. This dimensional change allows the cooling liquid to access different channel levels, maintaining velocity while expanding cooling coverage across the stator surface.
3Device complexity
If a simple spiral channel is used, then the structure is simple, but cooling efficiency is reduced due to pressure drop
Solution Approach 1:
The channel structure is segmented into multiple divided regions with dividing walls and communication holes. While this increases structural complexity compared to a simple spiral channel, it creates an interlaced cooling path that reduces pressure drop and maintains cooling efficiency by allowing the cooling liquid to flow through multiple shorter channel segments rather than one long continuous path.
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 design improves heat exchange efficiency by increasing fluid velocity and thermal convection coefficients near the outlet, reducing pressure drops and enhancing overall heat dissipation in rotary electric machines.
Implementation Method 1
the channel design with descending number raises the fluid velocity of the cooling liquid and the thermal convection coefficient adjacent to the outlet to improve the heat exchange adjacent to the outlet
Implementation Method 2
providing a jacket with a channel and injecting cooling liquid for heat exchange becomes the major means for heat dissipation of the rotary electric machine
Data Source
AI summary
A cooling structure for rotary electric machine is provided. The cooling structure for rotary electric machine comprises a sleeve, a plurality of dividers, a plurality of first walls and a plurality of second walls. The sleeve comprises an annular surface of a first half annular surface and a second half annular surface. The dividers are configured on the annular surface of the sleeve in parallel to provide multiple channels. The first walls are configured on the first half annular surface and between multiple corresponding dividers to provide multiple first division regions. The second walls are configured on the second half annular surface and between multiple corresponding dividers to provide multiple first division regions wherein the first division regions are asymmetric to the second division regions.