Permanent magnet synchronous motor and compressor using the same
US7453181B2 · kind B2 · utility
4Cited by
2References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2006 |
| Grant date | Nov 18, 2008 |
| Priority date | — |
| Expiry date | Dec 28, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04C18/0215
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet synchronous motor includes a rotor having cage windings and permanent magnets placed on an inner peripheral side of these cage winding bars, where the permanent magnets are placed and polarized so that a ratio θ/α between a circumferential pitch angle θ of magnetic flux distribution of the permanent magnets and a magnet pole pitch angle α is between 0.67 and 0.91.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.