Disk drive motor
US6205110A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1998 |
| Grant date | Mar 20, 2001 |
| Priority date | — |
| Expiry date | Jun 23, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/2027
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a disk drive motor comprising a rotor having an annular space formed therein coaxially with the axis of rotation, and balancing member accommodated in the annular space and capable of changing its mass distribution circumferentially along the circle of the annular space. In case of any imbalanced rotation occurring during the rotation, the balancing member temporarily gather to a portion of the annular space where the mass imbalance is taking place. However, when the motor speed exceeds the value at which resonance takes place due to coincidence between the frequency of the vibration of the balancing member and the natural frequency of the motor, the balancing members move to a position symmetrical with the point of mass imbalance to eliminate the mass imbalance, thereby suppressing the run-out.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.