无取向性电磁钢板
By controlling the crystal orientation difference and grain distribution of the non-oriented electromagnetic steel sheet, the problem of uneven residual stress distribution after punching was solved, ensuring the high roundness of the stator core inner diameter and improving the performance stability of the motor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NIPPON STEEL CORPORATION
- Filing Date
- 2022-03-30
- Publication Date
- 2026-07-17
AI Technical Summary
After the non-oriented electromagnetic steel sheet is punched and the stator core is formed, the uneven distribution of residual stress leads to uneven shape change of the stator core during core annealing, which affects the roundness of the inner diameter of the stator core and thus leads to a decrease in motor performance.
By controlling the crystal orientation difference and grain distribution of non-oriented electromagnetic steel sheets, ensuring that the grain area ratio with a crystal grain size of less than 200 μm does not exceed 10%, and meeting the conditions of D15MAX/D2AVE≦5.0 and DL/DC≦5.0, while controlling the chemical composition within a specific range, steel sheets that can suppress uneven distribution of residual stress are prepared.
It effectively suppressed the reduction in dimensional accuracy after processing and core annealing, improved the roundness of the stator core inner diameter, and reduced problems such as uneven motor rotation, vibration, and noise.
Smart Images
Figure CN117120648B_ABST