Permanent magnet motor and washing machine provided therewith
US7250703B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 23, 2005 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Nov 23, 2025 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD06F37/304
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet motor includes a rotor core having magnetic pole faces including first to third faces. The first face is formed on a peripherally central part and has a peripherally uniform width of the gap. Each of the second and third faces is formed on both peripheral ends respectively and has a width of a gap rendered larger as each of the second and third faces comes close to a boundary between magnetic poles. The first face ranges from ±15 degrees to ±35 degrees in electrical angle about a center of the magnetic pole and has such a circular arc shape that the gap width is increased by about 10% relative to a minimum gap width.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.