Split Stator Core Assembly With Inclined Yoke-Tooth Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stator cores for rotary electric machines face challenges in adequately preventing yoke core parts from moving both inward and outward in the peripheral direction, leading to potential instability and increased core loss due to compression stress.
Innovation Solution
A split-type stator core design featuring a band-like first core with inclined connection surfaces and recessed connection parts, allowing for secure fixation of second cores through inclined surfaces and recesses, reducing compression stress and core loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If circumferential contact surfaces are shaped to prevent tooth core parts from moving inward, then tooth core part stability is improved, but yoke core part movement outward cannot be adequately prevented
Solution Approach 1:
The connection surfaces are designed with asymmetric inclination angles: the first connection surface (on the yoke core part) has a different inclination angle than the second connection surface (on the tooth core part). This asymmetric design creates a mechanical interlocking effect where the inclined surfaces press against each other, preventing both inward movement of tooth core parts and outward movement of yoke core parts, thereby resolving the contradiction between the two stability requirements.
Solution Approach 2:
The connection surfaces are designed as inclined planes rather than flat surfaces, creating a wedge-like geometric structure. This curved/angled geometry transforms linear contact into a self-locking mechanism where any movement attempt generates compressive forces that reinforce the connection, effectively preventing movement in both directions simultaneously.
2Stability of the object's composition
If additional means are provided to prevent yoke core parts from moving outward, then yoke core part stability is improved, but device complexity increases
Solution Approach 1:
The inclined connection surfaces serve multiple functions simultaneously: they provide the primary mechanical connection between yoke and tooth core parts, prevent inward movement of tooth core parts, prevent outward movement of yoke core parts, and distribute mechanical stresses. This multi-functionality eliminates the need for separate fixation means, reducing structural complexity while maintaining stability.
Solution Approach 2:
The connection surfaces are integrated directly into the yoke core part and tooth core part structures themselves, rather than being separate components. The inclined surfaces are formed as part of the core components during manufacturing, merging the connection function with the structural components and avoiding additional parts or assembly steps.
3Ease of manufacture
If yoke core parts are loosely fitted to allow easy assembly, then ease of manufacture is improved, but compression stress increases leading to higher core loss
Solution Approach 1:
The inclination angles of the connection surfaces are optimized to specific ranges that balance assembly ease with stress reduction. By carefully selecting the angle parameters, the design achieves sufficient mechanical interlocking to minimize compression stress and core loss, while still allowing for practical assembly operations without requiring excessive force or precision.
Data Source
AI summary
A stator core 20 has a band-like first core 24 and a plurality of second cores 26. The first core 24 has a plurality of first yoke forming parts 24a and a plurality of connection parts 24b that connect the first yoke forming parts 24a adjacent to each other in the circumferential direction to each other. The second core 26 has a second yoke forming part 26a sandwiched between a pair of adjacent first yoke forming parts 24a and a tooth forming part 26b that projects inward in the radial direction from the first yoke forming parts 24a. The first yoke forming part 24a and the second yoke forming part 26a are connected to each other at a first connection surface 40 and a second connection surface 60.