Compressed powder core, powders for compressed power core, and method for producing compressed powder core
US10535454B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 2016 |
| Grant date | Jan 14, 2020 |
| Priority date | — |
| Expiry date | Oct 12, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F41/0246
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Provided is a compressed powder core that can suppress a decrease in the inductance even when a high magnetic field (of greater than or equal to 40 kA/m) is applied to the compressed powder core while suppressing an iron loss and a decrease in the strength of the compressed powder core. The compressed powder core 1A has soft magnetic particles 11A and aluminum nitride layers 12A formed on the surface layers of the respective soft magnetic particles 11A. The compressed powder core 1A has a ratio of the first differential relative permeability μ′L to the second differential relative permeability μ′H satisfying a relationship of μ′L/μ′H≤6, and has a magnetic flux density of greater than or equal to 1.4 T when a magnetic field of 60 kA/m is applied. The soft magnetic particles of the compressed powder core 1A contain Si in the range of 1.0 to 3.0 mass % and have, when analyzed using XRD, a peak area ratio Sal/Sfe of greater than or equal to 4%, the peak area ratio Sal/Sfe being the ratio of the area Sal of a peak waveform derived from AlN to the area Sfe of a peak waveform derived from Fe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.