Motor for rotating a disk-shaped information recording medium in a disk drive apparatus
US6316856A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Mar 8, 2020 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16C2370/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A motor for rotating a disk-shaped information recording medium for a disk drive apparatus which is capable of rotating a higher-capacity information recording medium and a relatively lower-capacity recording medium at different speeds. This motor includes a stator; a rotor that rotates with respect to the stator with a shaft as the center of rotation when a drive winding is energized; a bearing that is provided on the side of the stator and rotatably supports the shaft of the rotor; a dynamic pressure generation section for generating dynamic pressure by filling a fluid between the bearing and the shaft when the shaft is rotated above a predetermined speed; a judging member for judging whether the disk-shaped information recording medium that is attached to the rotor is a relatively lower-capacity medium or a higher-capacity medium; and a control section for supplying the drive winding of the stator with a drive signal for a first rotation speed when a judgment signal produced by the judging member indicates the relatively lower-capacity medium, and with a drive signal for a second rotation speed that is higher than the first rotation speed when the judgment signal indicates the h…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.