Motor Bracket Cooling Passage Design for Thermal Management
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Solution Overview
Problem
Existing motor designs with integrated control devices face challenges in achieving efficient cooling due to limitations in water pump performance, which restricts the improvement of cooling efficiency for both the stator and control device.
Innovation Solution
A motor design featuring a cylindrical bracket with a cooling passage system that includes a communication passage between the control device and stator cooling passages, allowing for opposite circumferential flow directions and reducing the length of the cooling passage, thereby enhancing cooling efficiency without relying on increased water pump performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water pump performance is improved to increase cooling water flow velocity, then cooling efficiency is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The cooling passage transitions from a conventional linear path to a three-dimensional structure that utilizes the radial dimension of the bracket. The passage extends radially outward from the control device, then radially inward toward the stator, creating a spatial arrangement that shortens the overall cooling path while improving heat dissipation efficiency without requiring higher pump performance
Solution Approach 2:
The cooling passage is divided into distinct functional segments: a first portion adjacent to the bracket main body for control device cooling, a second portion between the bracket and stator frame for stator cooling, and a communication passage coupling them. This segmentation allows optimized cooling for each component independently while maintaining system simplicity
2Temperature
If cooling passage length is reduced to improve cooling efficiency, then heat dissipation effectiveness increases, but the passage configuration becomes more complex
Solution Approach 1:
The cooling passage is integrated directly into the bracket structure, merging the cooling function with the structural component. The bracket simultaneously serves as a mechanical support and a cooling conduit carrier, eliminating the need for separate cooling channels and reducing overall system complexity
Solution Approach 2:
The passage utilizes radial positioning to create efficient cooling paths. By extending radially outward and then inward, the passage achieves short cooling distances while maintaining simple integration with the bracket structure, avoiding complex three-dimensional routing
3Temperature
If opposite circumferential flow directions are implemented in cooling passages, then cooling efficiency is significantly improved, but the passage design becomes more complex
Solution Approach 1:
The cooling medium flows in opposite circumferential directions in the first and second portions of the passage. This reverse flow arrangement creates enhanced convective cooling by preventing thermal boundary layer formation and improving heat transfer efficiency, while the simple radial-bracket integration keeps the design straightforward
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 the cooling efficiency of both the stator and control device, reduces the load on the water pump, and maintains cost-effectiveness by optimizing the cooling passage configuration, allowing for effective heat dissipation and reduced manufacturing costs.
Implementation Method 1
a cooling medium in the first portion and a cooling medium in the second portion flow in opposite circumferential directions with respect to one another
Implementation Method 2
The bracket is provided with a cooling passage through which a cooling medium is able to flow... significantly improves the cooling efficiency of the stator and the control device
Data Source
AI summary
A motor includes a rotating shaft, a rotor, a stator, a bracket, and a control device mounted on the bracket. The bracket includes a cylindrical bracket main body, and a stator frame which faces the bracket main body across a clearance and holds an outer surface of the stator on the radially inward side of the bracket main body. The control device is mounted on the bracket main body. The bracket is provided with a cooling passage, and an inflow port and an outflow port connected with the cooling passage. The cooling passage includes a control device cooling passage provided between the bracket main body and the control device, a stator cooling passage provided between the bracket main body and the stator frame, and a communication passage coupling the control device cooling passage and the stator cooling passage.