Permanent magnet, motor and electric generator
US9774219B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 2012 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | Feb 6, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22C2202/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an embodiment, a magnet material includes a composition represented by R(FepMqCur(Co1-aAa)1-p-q-r)z, where R is at least one element selected from rare earth elements, M is at least one element selected from Ti, Zr and Hf, A is at least one element selected from Ni, V, Cr, Mn, Al, Si, Ga, Nb, Ta, and W, p is 0.05≦p≦0.6, q is 0.005≦q≦0.1, r is 0.01≦r≦0.15, a is 0≦a≦0.2, z is 4≦z≦9, and a structure including an intragranular phase having a Th2Zn17 crystal phase and a grain boundary phase. An average crystal grain diameter of the intragranular phase is in a range of 20 to 500 nm, and an average thickness of the grain boundary phase is smaller than a magnetic domain wall thickness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.