Title:
REPLACEMENT SPRING MAGNET AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP3739266
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a bulked replacement spring magnet and its manufacturing method, and a motor, a sensor or the like with the replacement spring magnet without damaging magnet characteristics.
SOLUTION: The bulked replacement spring magnet has a structure, wherein raw powder is made dense, and boron atom and oxygen atom cohere among grains of the dense raw powder, and comprises a permanent magnet phase and a soft magnetic phase. Magnet material composition formula is NdxFe100-x-yBy wherein x=4 to 11, y=3 to 8 or x=7.5 to 10.5, y=5.5 to 7.5. The ratio of concentration of boron atom among dense raw powder grains to concentration of boron atom inside raw powder grain (intergranular concentration/intragranular concentration) is at least 1.2. The ratio of concentration of oxygen atom among the dense raw powder grains to concentration of oxygen atom inside raw powder grain (intergranular concentration/ intragranular concentration) is at least 1.2.
Inventors:
Norihisa Waki
Hideaki Ono
Munekatsu Shimada
Tatsuo Sugiyama
Hideaki Ono
Munekatsu Shimada
Tatsuo Sugiyama
Application Number:
JP2000291692A
Publication Date:
January 25, 2006
Filing Date:
September 26, 2000
Export Citation:
Assignee:
Nissan Motor Co., Ltd
International Classes:
G01P3/44; H01F1/08; B22F1/00; B22F3/00; B22F3/10; B22F9/10; C22C38/00; G01L3/10; G01P15/105; G01R33/038; H01F1/053; H01F1/057; H01F41/02; (IPC1-7): H01F1/08; B22F1/00; B22F3/00; B22F3/10; B22F9/10; C22C38/00; G01L3/10; G01P3/44; G01P15/105; G01R33/038; H01F1/053; H01F41/02
Domestic Patent References:
| JP11307327A | ||||
| JP11323509A | ||||
| JP8335508A | ||||
| JP10088295A | ||||
| JP10032134A | ||||
| JP11071644A |
Attorney, Agent or Firm:
Mikio Hatta
Yasuo Nara
Etsuko Saito
Katsuyuki Utani
Toshifumi Fujii
Yasuo Nara
Etsuko Saito
Katsuyuki Utani
Toshifumi Fujii