Motor having reduced cogging torque
US10256681B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 7, 2015 |
| Grant date | Apr 9, 2019 |
| Priority date | — |
| Expiry date | Sep 17, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor comprising a rotor rotatable about a rotor axis and a stator at least substantially circumscribing the rotor is provided. The stator includes a generally toroidal core including a plurality of arcuately spaced apart, radially inwardly extending teeth. Each of the teeth presents a radially innermost face that extends along a curved contour. A portion of the contour has a radius of curvature that corresponds to a circle having a center. The center is radially offset from the rotor axis. Furthermore, each of the teeth includes a radially extending arm having an end and a crown extending relative to the end. The crown presents a pair of arcuately spaced apart endmost tips, each of which has a rotor-facing side. The rotor-facing side includes a tapered portion that turns away from the rotor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.