Permanent magnet embedment rotating electric machine, motor for car air conditioner, and enclosed electric compressor
US7652405B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 2007 |
| Grant date | Jan 26, 2010 |
| Priority date | — |
| Expiry date | Mar 5, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K2213/03
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A plurality of convex portions are located inside of a virtual circumferential surface. Each convex portion connects an adjacent pair of circumferential portions with each other. Each convex portion is an arcuate curve bulging radially outward. Each convex portion defines a minimum radius. A difference between a radius R and the minimum radius is a depth Dh. Dhr=Dh×25.5/R. A range of an angular width A in relation to circumferential portion and a range of the depth Dh are set by the following expression,(5.6×Dhr+11.3)°×6/p≦A<35°×6/p andA<[360/p−2×arccos]° (1)Therefore, decrease in torque is prevented. Torque pulsation is suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.