Electrical machine with nonuniform pole teeth
US8022587B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 31, 2007 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Jan 11, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Electric machines which are excited with permanent magnets are to be improved in terms of their smoothness of operation and their loss properties. For this purpose, an electric machine is proposed comprising a first active part (40) on which one electric magnet (41, 42) and at least one permanent magnet (44) are mounted, and a second active part (43) which has a multiplicity of pole teeth (45, 46) and which interacts magnetically with the first active part (40). The pole teeth (45, 46) are spaced apart from one another in a non-uniform fashion in the direction (3) of the movement of the electric machine and/or have different average widths from one another, with the respective width of a tooth being measured in the direction (3) of movement and being averaged in terms of the extent of the tooth in the transverse direction with respect to the direction of travel. The geometry of the tooth causes the harmonics of the magnetic field to be influenced in a selective fashion. The second active part can be implemented cost-effectively as, for example, a simple punched sheet-metal part.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.