| 摘要 |
For the iron cores of an electrical machinery and apparatuses, such as transformers, electric motors and generators, mostly a grain-oriented electromagnetic steel sheet is used. Since the grain-oriented electromagnetic steel sheet has a (110) [001]texture and is thus easily magnetized in the rolling direction, the direction of magnetic flux in the iron cores is required to be coincident with the rolling direction. However, this requirement cannot be completely fulfilled due to the shape and an operation efficiency of producing the iron cores as well as generation of a magnetic reluctance in the butted iron-core elements. Laser irradiation regions are formed, according to the present invention, for example, on the following: the parts of the iron core where the rotational magnetic field is generated; the entire surface of the I-type elements or: the major part of the E or C type element. As a result of the laser-irradiation, the watt loss is low even where the complete coincidence of the easy direction of magnetization and the magnetic flux direction is difficult. |
| 申请人 |
NIPPON STEEL CORP., TOKYO, JP |
发明人 |
ICHIYAMA, TADASHI, SAGAMIHARA, KANAGAWA, JP;YAMAGUCHI, SHIGEHIRO, FUJISAWA, KANAGAWA, JP;IUCHI, TOHRU, KAWASAKI, KANAGAWA, JP;OHYA, YOSHIHIRO, KITAKYUSHU, FUKUOKA, JP |
