Rotor core and method of manufacturing the same
US9065318B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2013 |
| Grant date | Jun 23, 2015 |
| Priority date | — |
| Expiry date | Feb 11, 2034 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49012
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method of manufacturing a rotor core includes a first process of punching out punched holes 22, 23 forming outlines of keys 13, 14 in a thin metal strip 18, the holes 22, 23 including inside areas 25 located inside a shaft hole 12 and outside areas 26 continuous from the areas 25 and located outside the hole 12; a second process of punching out the hole 12 including recesses 35, 36 to avoid the keys 13, 14 and communicating with the holes 22, 23; and a third process of punching out an outline of a core sheet 11 having the hole 12 and laminating the sheets 11. Thereby, a shaft hole having keys is formed precisely, a thickness deviation of core sheets is eliminated, and a rotor core having homogeneous magnetism is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.