System, method, and program product for controlling communication of disk drive motor
US6339303B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 31, 2000 |
| Grant date | Jan 15, 2002 |
| Priority date | — |
| Expiry date | Mar 31, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/21
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A system, method, and program product for operating a disk drive motor according to an exponentially decaying commutation curve are disclosed. A disk drive includes a motor, a spindle driven by the motor, one or more rotatable storage media coupled to the spindle, a motor driver circuit coupled to the motor, and a disk drive controller coupled to the motor driver and other disk drive components. The various components of the disk drive are controlled during operation by signals generated by the disk drive system controller. In particular, the disk drive controller can provide commutation timing signals to the motor driver that, in turn, drives the motor. During the first part of motor start-up, the disk drive controller selects external commutation of the motor. Commutation values approximating the first portion of the ideal commutation curve are pre-defined and stored as a look-up table into a memory system. Commutation values approximating the second portion are derived from a linear equation having a slope based on an acceleration characteristic of the motor. If the motor fails to reach the critical BEMF speed, the slope is repeatedly decreased, as necessary, and commutation val…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.