Decreasing spin up time in a disk drive by adjusting a duty cycle of a spindle motor PWM signal to maintain constant average input current
US6967458B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2002 |
| Grant date | Nov 22, 2005 |
| Priority date | — |
| Expiry date | Jul 31, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05B11/28
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A disk drive is disclosed comprising a spindle motor for rotating a disk, wherein the current applied to the spindle motor is controlled by adjusting a duty cycle of a pulse width modulated (PWM) signal. A current sensor generates a current sense signal representing a current flowing from a supply voltage. The current sense signal is integrated to generate an integration signal. The integration signal is compared to a threshold, and the result of the comparison is used to adjust the duty cycle of the PWM signal. In this manner the disk drive draws essentially constant average input current from the supply voltage which decreases the spin up time of the disk.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.