Brushless motor and disk drive apparatus
US9209656B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2013 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | Mar 6, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K5/1677
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless motor includes a stationary unit and a rotary unit rotatably supported with respect to the stationary unit. The stationary unit includes an armature and a base member arranged to support the armature. The rotary unit includes a magnet, a hub made of a magnetic material and a rotor yoke made of a magnetic material. The armature includes a plurality of coil patterns arranged along a circumferential direction. The hub includes an inner lower surface, an outer lower surface and a recess portion. The recess portion is arranged between the inner lower surface and the outer lower surface and depressed upward. At least a portion of the magnet is accommodated within the recess portion. At least one of the inner lower surface and the outer lower surface is positioned above a lower surface of the magnet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.