Laminated core, rotary electric machine, pressurizing jig, and method for manufacturing laminated core
A laminated core with region-specific adhesive strengths addresses the issue of compressive stress-induced magnetic property deterioration by differentially bonding electromagnetic steel sheets, ensuring strong adhesion where magnetic flux is low and weak adhesion where it's high, thus improving machine performance.
Patent Information
- Application Number
- PCT/JP2025/014310
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-04-10
- Filing Date
- 2025-04-10
- Publication Date
- 2025-10-16
AI Technical Summary
The challenge of maintaining the laminated structure of electromagnetic steel sheets in rotating electric machines while minimizing the deterioration of magnetic properties due to compressive stress from adhesive shrinkage, particularly as sheets become thinner.
A laminated core design with varying adhesive strengths in different regions based on magnetic flux distribution, where regions with less magnetic flux have stronger adhesion and regions with more flux have weaker adhesion, using a pressing jig to apply differential pressure during bonding.
Ensures necessary fixing force while reducing the adverse impact on magnetic properties, thereby enhancing the performance of rotating electric machines by minimizing iron loss and other magnetic property degradations.