Twisted Spiral Cooling Channel for Motor Stator Heat Dissipation
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Solution Overview
Problem
Conventional motor cooling systems face inefficiencies in heat dissipation due to the lack of turbulence in cooling channels, leading to reduced motor performance and lifespan, as they rely on additional components like spoilers to generate secondary flows, complicating the manufacturing process.
Innovation Solution
A twisted spiral cooling channel with a continuously changing cross-section is introduced, using a sleeve and spiral duct with additive manufacturing, creating a complex secondary flow that enhances turbulence intensity and vorticity, improving convective heat dissipation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a spoiler is added to generate secondary flow in the cooling channel, then convection heat dissipation efficiency is improved, but device complexity and manufacturing inconvenience increase
Solution Approach 1:
The invention removes the spoiler component from the cooling system by integrating the secondary flow generation function directly into the cooling channel geometry itself. The channel cross-section is designed with asymmetric shapes (such as rectangular, trapezoidal, or triangular sections) that naturally generate secondary flows and turbulence without requiring additional separate components.
Solution Approach 2:
The invention combines the cooling channel structure with the turbulence generation function by incorporating asymmetric cross-sectional geometries directly into the channel design. This merging eliminates the need for separate spoiler components while achieving the same heat dissipation enhancement through geometric design alone.
2Ease of manufacture
If conventional spiral cooling channels are used, then manufacturing is simpler, but heat transfer uniformity between inner and outer walls is poor
Solution Approach 1:
The invention applies different cross-sectional geometries to different regions of the cooling channel. Specifically, the channel features asymmetric cross-sections with different side lengths adjacent to the inner and outer walls of the stator. This local variation in geometry compensates for the natural heat transfer differences between inner and outer walls, achieving more uniform heat dissipation across the entire stator surface.
3Ease of manufacture
If the cooling channel cross-section is constant, then manufacturing is easier, but turbulence intensity and vorticity are insufficient
Solution Approach 1:
The invention employs asymmetric cross-sectional geometries throughout the cooling channel, including rectangular, trapezoidal, and triangular sections with unequal side lengths. This asymmetry creates flow separation, secondary flows, and increased turbulence intensity as the cooling fluid passes through, significantly enhancing convective heat transfer efficiency compared to symmetric constant cross-section channels.
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
The twisted spiral cooling channel increases the convective heat transfer coefficient by 9% to 18%, enhances turbulence and vorticity, and is cost-effective, suitable for both motor and large electromechanical device heat dissipation, with improved uniformity in heat transfer coefficients across inner and outer walls.
Implementation Method 1
increasing turbulence intensity and vorticity
Implementation Method 2
form a complex secondary flow
Implementation Method 3
improving the convection heat dissipation efficiency
Data Source
AI summary
A motor, a cooling device, and a cooling method are disclosed. The cooling device is mounted on a stator of the motor. The cooling device includes a sleeve and a spiral duct. A wall of the sleeve has a spiral groove extending along the sleeve. The sleeve is sleeved onto the stator. The spiral duct is mounted in the spiral groove. The spiral duct has a first spiral form corresponding to the spiral groove, so that the spiral duct is correspondingly installed in the spiral groove. The spiral duct has a second spiral form extending along the spiral duct. A twisted spiral cooling channel is formed along the spiral pathway. A cooling fluid flowing through the twisted spiral cooling channel is subjected to the continuously changing cross-section of the twisted spiral cooling channel to enhance the swirl intensity, thereby improving the convection heat transfer effectiveness.