Stator Core Grooves for Integrated Fluid Cooling
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Solution Overview
Problem
Existing electric motor stators face challenges with excess heat generation due to high current densities and rapidly changing flux densities, leading to inefficient operation and potential damage.
Innovation Solution
The stator design incorporates an axial groove on the outer surface to direct cooling fluid from one end to the other, with an annulus groove in fluid communication to collect and circulate the cooling fluid, enhancing heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fluid cooling systems are used to cool the stator, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The cooling channels are nested within the stator core structure itself, with axial grooves formed on the outer surface and annular grooves positioned between stator teeth. This integration eliminates the need for separate external cooling jackets or housings, reducing device complexity while maintaining effective heat dissipation
Solution Approach 2:
The stator core is designed with a network of interconnected cooling channels including axial grooves and annular grooves that allow cooling fluid to permeate through the structure. This porous-like channel system provides extensive cooling surface area within the core, improving heat dissipation without requiring complex external cooling systems
2Loss of energy
If cooling fluid is directed through axial grooves, then heat dissipation efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The cooling system is segmented into distinct axial grooves and annular grooves with specific functions. The axial grooves handle fluid transport along the stator length, while annular grooves provide cooling at specific radial positions between teeth. This segmentation allows each groove type to be optimized independently, reducing overall manufacturing precision requirements
Solution Approach 2:
The cooling channels are formed on the outer surface of the stator core rather than requiring precise internal channel formation. This partial action approach, where cooling features are added to the exterior surface, significantly reduces manufacturing precision requirements compared to forming channels through the entire core structure
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 effectively manages heat dissipation, improving the efficiency and longevity of the stator by reducing electrical impedance and preventing damage from excessive heat.
Implementation Method 1
an axial groove formed on its outer surface along a longitudinal axis that is used to direct a cooling fluid from a first end of the stator core towards a second end of the stator core
Implementation Method 2
substantial current densities and rapidly changing flux densities experienced by the stator can lead to excess heat generation in the stator. The excess heat can lead to inefficient operation... Fluid cooling systems utilizing oil or water cooling jackets, sleeves, or housings with cooling features
Implementation Method 3
the stator core has an annulus groove formed on its outer surface, with the annulus groove in fluid communication with the axial groove. The annulus groove receives the cooling fluid from the axial groove
Data Source
AI summary
A stator is disclosed. The stator has a stator core that has stator poles protruding in a radial direction and a stator. The stator core has an axial groove formed on its outer surface along a longitudinal axis that is used to direct a cooling fluid from a first end of the stator core towards a second end of the stator core that is opposite the first end. Further, the stator core has an annulus groove formed on its outer surface, with the annulus groove in fluid communication with the axial groove. The annulus groove receives the cooling fluid from the axial groove, and is located between the first end and the second end of the stator core.