Stator Coil Turn Portions Crossing for Cooling Airflow
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing stator designs for electric rotating machines face challenges in effectively cooling the turn portions of small electric conductor segments due to shielding by large electric conductor segments, which restricts airflow and impairs heat dissipation.
Innovation Solution
A stator design featuring a hollow cylindrical core with slots and a stator coil arrangement where the first and second turn portions cross each other, allowing direct exposure to cooling air, with the first turn portion acting as a guide vane to enhance airflow and effectively cool both turn portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the turn portions of large and small electric conductor segments are arranged in the same extending direction, then the structure is simplified, but the small turn portions are shielded by large turn portions from cooling air flow
Solution Approach 1:
The patent resolves this contradiction by introducing asymmetric extending directions for the turn portions. While this increases structural complexity slightly, it dramatically improves the cooling effectiveness of the small turn portions by eliminating the shielding effect, achieving a balanced design that maintains reasonable simplicity while solving the critical cooling problem.
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 enhances cooling efficiency by ensuring both turn portions are exposed to airflow, reducing resistance and increasing airflow rate, thereby lowering the temperature of the stator coil while maximizing space factors and minimizing electrical resistance.
Implementation Method 1
when cooling air is supplied from the radially inside to coil ends of the stator coil... the cooling air first makes contact with the turn portions of the large electric conductor segments... the turn portions of the small electric conductor segments will be shielded from the cooling air
Data Source
AI summary
A stator coil includes first to fourth in-slot portions and first and second turn portions. Both the first and third in-slot portions are received in one slot of a stator core, while both the second and fourth in-slot portions are received in another slot. The first and second turn portions both protrude from an axial end face of the stator core and respectively connect the pair of the first and second in-slot portions and the pair of the third and fourth in-slot portions. The second turn portion is located inside the first turn portion. When viewed along an axial direction of the stator core, the first and second turn portions extend so as to cross each other with a reference line C interposed therebetween; the reference line C is defined to extend along a circumferential direction of the stator core through an intersection between the first and second turn portions.