Magnetic disk device and method for measuring counter electromotive voltage of spindle motor
US11776573B2 · kind B2 · utility
0Cited by
5References
13Claims
0Family size
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Key dates
| Filing date | Mar 10, 2021 |
| Grant date | Oct 3, 2023 |
| Priority date | — |
| Expiry date | Mar 10, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
According to an embodiment, a magnetic disk device includes a magnetic disk, a spindle motor that rotates the magnetic disk, a motor driver, and a controller. The motor driver supplies a motor current to the spindle motor and measures a counter electromotive voltage of the spindle motor every time the spindle motor makes one rotation. After the rotation of the magnetic disk starts, the controller adjusts a motor position where the counter electromotive voltage is measured to a set first position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.