Spin motor control system for a hard disk assembly
US5258695A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 1990 |
| Grant date | Nov 2, 1993 |
| Priority date | — |
| Expiry date | Dec 19, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spin motor control system includes a BEMF commutation circuit, a startup circuit and a monitor circuit, each of which operate utilizing digital techniques. The BEMF commutation circuit includes first and second counters that are programmable to accommodate for changing system parameters. The BEMF commutation circuit does not require the incorporation of an external capacitor, is insensitive to leakage current, and provides stable timing characteristics. The startup circuit also includes a counter and is programmable to accommodate for changing system parameters. The startup circuit does not require an external capacitor and provides stable generation of the startup pulses. The monitor circuit includes first and second counters for blanking the BEMF circuitry after commutation. The monitor circuit further includes circuitry for detecting and correcting the direction of rotation of the spin motor. The monitor circuit provides a microprocessor interface to allow for changing motor parameters and environmental conditions, eliminates the requirement of a capacitor, and provides stable timing characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.