| (19) |
 |
|
(11) |
EP 0 372 948 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
29.05.1991 Bulletin 1991/22 |
| (43) |
Date of publication A2: |
|
13.06.1990 Bulletin 1990/24 |
| (22) |
Date of filing: 07.12.1989 |
|
| (51) |
International Patent Classification (IPC)5: H01F 1/053 |
|
| (84) |
Designated Contracting States: |
|
DE FR GB |
| (30) |
Priority: |
08.12.1988 JP 308720/88
|
| (71) |
Applicant: FUJI ELECTROCHEMICAL CO.LTD. |
|
Minatoku
Tokyo 105 (JP) |
|
| (72) |
Inventors: |
|
- Yasumura, Takaaki
Kosai-shi
Shizuoka (JP)
- Kiyomiya, Teruo
Kosao-shi
Shizuoka (JP)
- Mizuno, Yasutoshi
Toyohashi-shi
Aichi (JP)
- Matsui, Kazuo
Toyohashi-shi
Aichi (JP)
|
| (74) |
Representative: Lewin, John Harvey et al |
|
Elkington and Fife
Prospect House
8 Pembroke Road
Sevenoaks, Kent TN13 1XR
Sevenoaks, Kent TN13 1XR (GB) |
|
| |
|
| (54) |
Permanent magnet composition |
(57) An improved permanent magnet oomposition comprising 22 to 28 wt% R, 5 to 16% iron,
0.2 to 6.5 wt% copper, 0.1 to 6 wt% manganese, 0.5 to 6 wt% A, 0.1 to 2 wt% B and
the balance cobalt, in which R is at least one of rare earth elements including yttrium,
A is at least one of zince and zirconium and B is at least one element selected from
the group of aluminum, bismath and thallium.