Gallium-containing magnet for a motor
US4960474A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 1988 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Sep 8, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K15/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In a magnetically anisotropic magnet for use in a motor, comprising at least one rare earth element (R), Fe and boron (B), said magnet having fine crystal grains, the improvement comprising Ga added in the magnet so that the magnet has a surface magnification of not less than 6, a residual magnetic flux density in the direction of easy magnetization of not less than 11 kG and a coercive force of not less than 12 kOe. The invention also provide a method of producing the magnetically anisotropic magnet for use in a motor, comprising the steps of: forming flakes by rapid quenching a molten alloy consisting of at least one rare earth element (R), Fe, boron (B) and an optical metal element (M); compacting the flakes to provide a green compact; and warm plastic working the green compact at a temperature between 600.degree. C. and 800.degree. C. at a strain rate of 0.0001 to 0.1 per second with a plastic working ratio (ho/h) of not less than 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.