Methods and apparatus for preventing demagnetization in interior permanent magnet machines
US7843100B2 · kind B2 · utility
16Cited by
0References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2009 |
| Grant date | Nov 30, 2010 |
| Priority date | — |
| Expiry date | Mar 18, 2029 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An internal permanent magnet machine (“IPM machine”) of the type used, for example, with traction motors and hybrid electric vehicles, includes a rotor having a plurality of ferrite magnets arranged in one or more layers, wherein at least one of the layers includes rare earth magnets (e.g., NdFeB magnets) adjacent to the ferrite magnets to prevent or reduce demagnetization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.