Electric motor having rotor assembly with segmented permanent magnet
US11791676B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 2, 2020 |
| Grant date | Oct 17, 2023 |
| Priority date | — |
| Expiry date | Nov 20, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet motor comprises: a rotor assembly configured to be rotatable relative to a stator, wherein the rotor assembly defines magnet pockets, a segmented permanent magnet comprising a plurality of magnet segments, which include one or more magnet segments of the segmented permanent magnet have different magnetic material from another or other magnet segments of the segmented permanent magnet, is disposed in each of the magnet pockets of the rotor assembly. The segmented permanent magnet is segmented in a circumferential direction. The one or more magnet segments of the segmented permanent magnet comprises magnetic material having higher coercivity, or operable at a higher temperature, than the another or other magnet segments of the segmented permanent magnet. The one or more magnet segments of the segmented permanent magnet comprise rare earth permanent magnet, high energy density magnet, samarium cobalt (Sm—Co) magnet or neodymium iron boron (Nd—Fe—B) magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.