Yokeless Disc Motor Stator Cooling Structure for High Power Density
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Solution Overview
Problem
High-power density disc permanent magnet motors face significant heat dissipation challenges due to compact structures, leading to high temperature rises and potential damage to armature winding insulation, with existing cooling systems inadequately addressing the heat dissipation of stator cores and tooth shoes.
Innovation Solution
A stator liquid cooling structure for yokeless disc motors, featuring an annular stator bracket with radial cooling channels, baffle plates, and circumferential cooling discs, where cooling liquid contacts both the stator cores and armature winding, enhancing heat dissipation through a network of annular and radial channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor structure is made compact to increase power density, then the power density is improved, but the heat dissipation capacity deteriorates leading to high temperature rise
Solution Approach 1:
The cooling system is segmented into multiple independent cooling channels including circumferential cooling channels in the stator bracket, radial cooling channels, and circumferential cooling channels in the tooth shoes. This segmentation allows heat from different components (stator core, armature winding, tooth shoes) to be dissipated through dedicated pathways, effectively managing temperature distribution in the compact high-power-density structure
Solution Approach 2:
The cooling system transitions from conventional single-dimension cooling to multi-dimensional cooling by implementing circumferential cooling channels around the stator core, radial cooling channels from the stator bracket to the armature winding, and additional circumferential cooling in the tooth shoes. This three-dimensional cooling network comprehensively addresses heat dissipation in all critical areas simultaneously
2Device complexity
If the cooling channel only contacts the armature winding, then the armature winding cooling is simplified, but the stator core heat dissipation deteriorates especially at tooth shoes
Solution Approach 1:
The stator bracket serves multiple cooling functions: it contains circumferential cooling channels for cooling the stator core, provides radial cooling channels to cool the armature winding, and supports the tooth shoe assemblies that have their own circumferential cooling channels. This multi-functional design ensures comprehensive cooling coverage without proportionally increasing system complexity
Solution Approach 2:
The stator bracket acts as an intermediary cooling component that transfers heat from both the stator core (through its circumferential channels) and the armature winding (through radial channels). The tooth shoes serve as intermediaries between the stator core and the cooling system, with their own circumferential channels that directly cool the tooth shoe regions, effectively mediating heat transfer in previously difficult-to-cool areas
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 proposed cooling structure significantly improves heat dissipation capacity and motor safety by ensuring effective cooling of both stator cores and armature windings, thereby enhancing power density and reducing temperature rises.
Implementation Method 1
cooling liquid contacts both the stator cores and armature winding, enhancing heat dissipation
Implementation Method 2
cooling structure significantly improves heat dissipation capacity... enhancing power density and reducing temperature rises
Data Source
AI summary
A stator liquid cooling structure and a stator structure of a stator yokeless disc motor are provided. The cooling structure includes an annular stator bracket and a water jacket. An outer periphery of the stator bracket is in a groove structure and is fixedly connected with the water jacket. Opposite upper and lower ends of the water jacket are provided with a liquid inlet and a liquid outlet. The stator structure includes stator cores, an armature winding, the stator bracket and the water jacket. A first stator core and a second stator core of the stator cores are same in structure and oppositely arranged. The armature winding is wound on first stator tooth bodies and second stator tooth bodies of the stator cores; the first stator tooth bodies and the second stator tooth bodies are inserted into gaps between adjacent blade-shaped cavities and fixed on the stator bracket.