Spindle motor, and recording and reproducing apparatus equipped with the same
US7535134B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2006 |
| Grant date | May 19, 2009 |
| Priority date | — |
| Expiry date | Nov 13, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/2009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
With a spindle motor 20, a stator core 8 comprises a plurality of salient pole components 51 that are formed in a radial shape, are wound with a stator coil 9, and are disposed at a uniform angle except for a non-equiangular pitch portion, an circular outer peripheral yoke 52 formed so as to be continuous with the outer peripheral side of the salient pole components 51, a cut-out 55 which is formed by cutting out part of the outer peripheral yoke 52 in an approximate sector-shape except in the non-equiangular pitch portion of the salient pole components 51, and a compensating pole plate 11 which is provided in the cut-out 55 along the ends on the inner peripheral side of the non-equiangular pitch portion where the salient pole components 51 are formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.