Motor
US11322996B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2019 |
| Grant date | May 3, 2022 |
| Priority date | — |
| Expiry date | Apr 17, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor includes a rotation shaft, a rotor, and a stator. The rotor includes a rotor core and magnetic pole portions respectively including permanent magnets embedded in the rotor core. The magnetic pole portions have polarities that differ alternately in a circumferential direction. A projection projecting radially outward from an outer circumferential portion of the rotor core is arranged between the magnetic pole portions having different polarities. In a radial opposing relationship of the rotor core and the teeth taken at different times while the rotor is revolved once, at a certain time, a quantity of the teeth that oppose one of the magnetic pole portions and do not oppose the projection is greater than a quantity of the teeth that simultaneously oppose two of the magnetic pole portions adjacent to each other in the circumferential direction and the projection located in between the magnetic pole portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.