Laminated core with welding mark, rotary electric machine having the same, and method for manufacturing laminated core with welding mark
US11575284B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2020 |
| Grant date | Feb 7, 2023 |
| Priority date | — |
| Expiry date | Aug 6, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K15/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A laminated core has a plurality of steel plates that are laminated in a thickness direction. The laminated core has a line shaped welding mark connecting a plurality of steel plates. The welding mark extends over the plurality of steel plates at the end face where the plurality of steel plates are exposed. The welding mark has a welding depth which fluctuates with a wavelength that is longer than the thickness of the steel sheet. The welding mark has a continuous portion in which the welding depth extends over a plurality of steel plates without fluctuation. Furthermore, the welding mark has a fluctuation portion in which the welding depth periodically fluctuates over a plurality of steel plates. The depth in the continuous portion is substantially equal to the depth in the fluctuation portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.