Stator Turn Portions With Stepped Gaps For Coolant Penetration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electric rotating machines with stators having step-shaped turn portions face inadequate cooling due to insufficient penetration of coolants, leading to performance degradation from overheating.
Innovation Solution
The stator design includes a stator core with slots and conductive wire windings, featuring first and second turn portions with distinct step configurations that allow coolant to flow through gaps between them, enhancing cooling efficiency without increasing the projection height or radial width of the turn portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If step portions are formed on turn portions to increase arranging density and reduce projection height, then the compactness and output power are improved, but coolant penetration into turn portions becomes insufficient causing overheating
Solution Approach 1:
The turn portions are segmented into multiple steps (first step portion and second step portion) with different heights. This segmentation creates gaps between the stepped structures that allow coolant to penetrate and flow through the turn portions, solving the overheating problem while maintaining the compact arrangement density achieved through stepped design
Solution Approach 2:
Different parts of the turn portions have different heights (local quality variation) to serve different functions: the first step portion provides compact arrangement while the second step portion creates coolant flow paths. This local differentiation allows simultaneous achievement of compactness and adequate cooling
2Volume of moving object
If turn portions are densely arranged to reduce projection height, then the device compactness is improved, but coolant flow access to turn portions is reduced
Solution Approach 1:
The cooling solution moves from a two-dimensional surface cooling approach to a three-dimensional internal cooling approach by creating vertical gaps through stepped structures. These gaps allow coolant to penetrate into the previously inaccessible interior regions of densely arranged turn portions, enabling effective cooling without increasing projection height
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 cools the turn portions, reducing performance degradation from overheating and enabling a compact, high-output electric rotating machine.
Implementation Method 1
a coolant such as ATF for cooling the stator does not sufficiently penetrate into the turn portions, causing the stator winding to be insufficiently cooled
Implementation Method 2
a coolant such as ATF for cooling the stator does not sufficiently penetrate into the turn portions, causing the stator winding to be insufficiently cooled
Data Source
AI summary
The stator of an electric rotating machine includes a stator core having slots formed therein along a circumferential direction thereof, and a stator winding formed by conductive wires wound on the slots. The stator winding includes in-slot portions accommodated in the slots and turn portions each of which connects each adjacent two of the in-slot portions outside of the slots. Each of the turn portions includes a first turn portion formed with M1 steps (m1 being a positive integer) extending along axial ends of the stator core, and a second turn portion formed with m2 steps (m2 being an integer larger than m1) extending along the axial ends.