Permanent magnet buried type electric motor
US8405270B2 · kind B2 · utility
7Cited by
6References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2008 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | May 9, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Supposing a straight line joining rotation center O of a rotor and a magnetic pole middle, that is, a middle of permanent magnets (25) to be a d-axis, and a straight line joining rotation center O and an intermediate point of mutually adjacent permanent magnets (25) to be a q-axis, mutually adjacent arcs A1 and A2 are composed such that radius R1 of arc A1 at the d-axis side is larger than radius R2 of arc A2 at the q-axis side, and that, at intersection point β of mutual arcs A1 and A2, angle α of tangent u of arc A2 at the q-axis side with respect to tangent t of arc A1 at the d-axis side is set by −3 degrees≦α≦2 degrees.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.