Electric machine, in particular brushless synchronous motor
US7233090B2 · kind B2 · utility
17Cited by
13References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 26, 2003 |
| Grant date | Jun 19, 2007 |
| Priority date | — |
| Expiry date | May 26, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K29/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electrical machine, in particular a brushless synchronous motor has a stator (14) and a rotor (12) with salient poles (18) disposed distributed over its circumference, each of which poles has an enclosed permanent magnet (11) and a pole shoe (19) that extends radially outward from the permanent magnet and defines an air gap (13) between the stator (14) and rotor (12). In order to achieve a low cogging torque and a low torque undulation, the pole shoes (19) are embodied as magnetically anisotropic, with a preferred direction of the greater magnetic conductivity extending parallel to the radial salient pole axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.