Electrical Steel Sheet Texture for Compressive Stress Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrical steel sheets used in divided iron cores for motors suffer from decreased magnetic properties due to compressive stress, particularly in the C direction, which affects their performance in hybrid vehicles and air conditioner compressors.
Innovation Solution
The electrical steel sheet is engineered to maintain excellent magnetic properties by controlling the accumulation degree of specific crystal orientations, such as Goss and Cube orientations, through a specific texture and chemical composition, ensuring optimal performance under compressive stress in the C direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional electrical steel sheet is used for divided iron core, then manufacturing is simplified, but magnetic properties decrease under compressive stress
Solution Approach 1:
The invention changes the crystal orientation parameters of the electrical steel sheet by controlling the accumulation degree of specific orientations (Cube: 1.5-5.0, Goss: 2.0-6.0, and (110)<001>: 8.0-15.0). This parameter control allows the material to maintain excellent magnetic properties in both L and C directions even under compressive stress, resolving the contradiction between ease of manufacture and reliability of magnetic properties
Solution Approach 2:
The invention creates a composite crystal structure by combining multiple crystal orientations (Cube, Goss, and (110)<001> orientations) in specific proportions. This composite texture structure provides both excellent magnetic properties under compression and ease of manufacturing for divided iron cores
2Strength
If electrical steel sheet is subjected to shrink fitting, then divided iron core is fixed to case, but compressive stress reduces magnetic properties
Solution Approach 1:
The invention modifies the crystal orientation parameters to achieve a texture where Cube orientation is 1.5-5.0 and Goss orientation is 2.0-6.0. This parameter optimization enables the steel sheet to maintain excellent magnetic properties even when subjected to compressive stress during shrink fitting, while still achieving sufficient fixing strength
Solution Approach 2:
The invention applies preliminary anti-action by pre-controlling the crystal texture before the shrink fitting process. By establishing the appropriate orientation distribution in advance, the material becomes resistant to the adverse effects of compressive stress that will occur during assembly, preventing magnetic property degradation before it can happen
3Ease of operation
If compressive stress acts in C direction, then divided iron core can be assembled, but magnetic properties in C direction decrease
Solution Approach 1:
The invention optimizes the crystal orientation parameters specifically to address C-direction performance under compression. By controlling the accumulation degree of (110)<001> orientation to be 8.0-15.0 in addition to Cube and Goss orientations, the material achieves excellent magnetic properties in the C direction even when compressive stress is applied during assembly operations
Data Source
Figure 1~2
Figure 3~4
AI summary
An electrical steel sheet includes: a specific chemical composition; a crystal grain diameter of 20 µm to 300 µm; and a texture satisfying Expression 1, Expression 2, and Expression 3 when the accumulation degree of the (001)[100] orientation is represented as Icube and the accumulation degree of the (011) [100] orientation is represented as IGoss. IGoss+ICube≧10.5 IGoss/ICube≧0.50 ICube≧2.5