| 发明名称 |
PERMANENT MAGNET AND VARIABLE MAGNETIC FLUX MOTOR |
| 摘要 |
The present invention provides a permanent magnet suitable as a variable flux magnet for a variable magnetic flux motor. A permanent magnet comprising R (R is composed of 75 at % or more of Nd and 25 at % or less of at least one element selected from the group consisting of Y, Ce, La, Pr, Sm, Eu, Gd, Er, Tm, Yb and Lu), Fe and B as the main component, wherein, said permanent magnet is composed of a main phase of a crystal structure represented by R2Fe14B, a ratio of the element R to all constituent element satisfies 11.8 at %≦R≦12.2 at %, a cross-sectional area ratio Are of the sub-phase with a higher concentration of R than that of the main phase to the whole magnet structure satisfies 0%<Are≦1.3%, and a cross-sectional area ratio Ama of the main phase to the whole magnet structure is 97%≦Ama. |
| 申请公布号 |
US2015294771(A1) |
申请公布日期 |
2015.10.15 |
| 申请号 |
US201514681482 |
申请日期 |
2015.04.08 |
| 申请人 |
TDK CORPORATION |
发明人 |
TANAKA Daisuke;ENOKIDO Yasushi |
| 分类号 |
H01F1/057;H02K1/02;C22C38/00 |
主分类号 |
H01F1/057 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A permanent magnet comprising R, Fe and B as the main component,
wherein, R is composed of 75 at % or more of Nd and 25 at % or less of at least one element selected from the group consisting of Y, Ce, La, Pr, Sm, Eu, Gd, Er, Tm, Yb and Lu, said permanent magnet is composed of a main phase of a crystal structure represented by R2Fe14B, a ratio of the element R to all constituent element falls within the range of 11.8 at %≦R≦12.2 at %, a cross-sectional area ratio Are of the sub-phase with a higher concentration of R than that of said main phase to the whole magnet structure satisfies 0%<Are≦1.3%, and a cross-sectional area ratio Ama of said main phase to the whole magnet structure satisfies 97%≦Ama. |
| 地址 |
Tokyo JP |
