Groove Unit Cooling Jacket for Rotary Electric Machine Stator
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Solution Overview
Problem
Existing cooling jackets for rotary electric machines have inefficiencies in production processes and design, leading to suboptimal cooling performance and increased production time.
Innovation Solution
A cooling jacket design featuring a tubular main body with a groove unit that extends axially on the outer periphery, formed using a hobbing process, which allows for efficient production by eliminating radial outward portions and enabling a larger surface area for cooling, thereby improving cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional cooling jacket design with deep grooves is used, then cooling performance is improved, but machining time and production complexity increase
Solution Approach 1:
The invention changes the groove depth parameter from deep to shallow, and compensates by increasing the number of groove threads. This parameter substitution maintains cooling effectiveness while dramatically reducing machining time and production complexity
Solution Approach 2:
The invention divides the cooling function into multiple separate groove threads instead of using fewer deep grooves. By segmenting the cooling channels into multiple shallow grooves, the total cooling surface area is maintained or increased while each individual groove requires less machining time
2Area of stationary object
If deep grooves are machined in the cooling jacket, then cooling surface area is increased, but machining time and production costs increase
Solution Approach 1:
The invention transitions from increasing cooling surface area through vertical depth (radial direction) to increasing surface area through horizontal multiplication (axial direction with multiple threads). This dimensional shift allows achieving larger total cooling area with shallower, faster-to-machine grooves
Solution Approach 2:
The hobbing process is designed to cut multiple groove threads simultaneously in a single pass, performing preliminary action by pre-configuring the hob tool with multiple cutting edges that create multiple grooves at once, thereby reducing total machining time
3Ease of manufacture
If the groove unit does not extend to the end faces of the main body, then manufacturing is simplified, but cooling effectiveness is reduced
Solution Approach 1:
The invention optimizes the groove axial length parameter to extend fully to the end faces of the main body, maximizing the axial coverage of cooling channels. This parameter optimization ensures that cooling effectiveness is maximized while the groove depth remains shallow for ease of manufacture
Solution Approach 2:
The groove unit design serves dual functions: it provides efficient cooling channels that extend to end faces for maximum cooling effectiveness, and simultaneously maintains manufacturing simplicity through shallow depth and standardized hobbing process compatibility
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 design enhances production efficiency and cooling performance by allowing for a greater number of threads and a shallower groove depth, reducing machining time and costs while improving heat dissipation.
Implementation Method 1
a cooling jacket including a groove unit defining a flow channel of a cooling medium... to cool a stator that has generated heat
Implementation Method 2
a groove unit defining a flow channel of a cooling medium... through which cooling medium passes
Data Source
AI summary
A cooling jacket capable of improving production efficiency. The cooling jacket includes a tubular main body having a first end face and a second end face, and a groove unit defining a flow channel of a cooling medium successively disposed axially on an outer periphery of the main body. The cooling jacket includes no portion located radially outward from a bottom of the groove unit between a first end portion of the groove unit located on the axial rear side of the main body and the first end face of the main body.