Brushless motor and recording disk driving apparatus having the brushless motor
US7345388B2 · kind B2 · utility
0Cited by
5References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2005 |
| Grant date | Mar 18, 2008 |
| Priority date | — |
| Expiry date | Aug 29, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K21/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless motor as an example of the invention has a stationary assembly 2 having a first housing member 10 made of a ferromagnetic material and a stator 20 held in the first housing member 10, and a rotor 6 having a rotor magnet 70 facing the stator 20. A annular shield plate 80 held by the rotor 6 is disposed between the rotor magnet 70 and the first housing member 10 and, further, an outer circumferential face 80a of the shield plate 80 is disposed between a magnetically neutral area 46 in the radial direction in the lower end of the rotor magnet 70 and the outer circumferential face of the rotor magnet 70.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.