Cylindrical permanent magnet and method of manufacturing
US4547758A · kind A · utility
29Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 2, 1982 |
| Grant date | Oct 15, 1985 |
| Priority date | — |
| Expiry date | Dec 2, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S264/58
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A cylindrical permanent magnet suitable for use as the rotor magnet of a stepping motor. The magnet is a sintered cylindrical permanent magnet having a composition expressed by MO.nFe.sub.2 O.sub.3, where M represents Ba, Sr, Pb or mixture thereof, while n represents a value of 5 to 6. The sintered cylindrical permanent magnet is provided on its surface with multipolar anisotropy of more than 8 (eight) magnetic poles. Disclosed also is a method of producing the cylindrical permanent magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.