Method for identifying irreversible demagnetization of grain boundary diffusion NdFeB magnet
US11921174B1 · kind B1 · utility
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13Claims
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Key dates
| Filing date | Jul 11, 2023 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Jul 11, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/0571
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present application relates to a technical field of determining an irreversible demagnetization of a grain boundary diffusion NdFeB magnet, and more particularly, to a method for identifying an irreversible demagnetization of a grain boundary diffusion NdFeB magnet by magnetic field distribution. After applying a reverse magnetic field to a saturatedly magnetized grain boundary diffusion NdFeB magnet, if a number of magnetic poles on a non-diffusion face of the grain boundary diffusion NdFeB magnet is increased, it is determined that there is an irreversible demagnetization in the grain boundary diffusion NdFeB magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.