Permanent magnet embedded motor
US7042127B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 2004 |
| Grant date | May 9, 2006 |
| Priority date | — |
| Expiry date | Apr 1, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K1/276
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet embedded motor including a rotor which is provided with a plurality of slits and a plurality of permanent magnets embedded into the slits and a stator which is provided with an iron core having a plurality of slots to which a coil is wound and is arranged to face the rotor via a gap. The slit includes a permanent magnet embedded part into which the permanent magnet is embedded in a direction perpendicular to the radial direction of the rotor and an “L”-shaped air gap part integrally provided on both ends of the permanent magnet embedded part. An angle “θ1” for one pole of the rotor and an angle “θ2” of the “L”-shaped air gap part are set to be 0.1≦θ2/θ1≦0.3. Further, a radius “R” of a circumscribed circle of the rotor and a radius “R1” for forming an outer peripheral face of the rotor at a portion of the “L”-shaped air gap part are preferably set to be 0.1≦(R−R1)/R≦0.3.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.