Electronic index pulse generating system for speed control in rotating disk data storage apparatus
US5400191A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1994 |
| Grant date | Mar 21, 1995 |
| Priority date | — |
| Expiry date | Jun 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B19/28
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An index pulse generating system utilizes two periodic motor speed signals, one generated by a speed sensor coil actuated upon by a permanent magnet rotor mounted to a turntable, and the other generated by one of magnetoelectric converters acted upon by another permanent magnet rotor mounted to the turntable as a part of a disk drive motor. The two motor speed signals are translated respectively into two series of discrete motor speed pulses. One of the two series of motor speed pulses are produced at rates of two different predetermined numbers per complete revolution of the turntable. The two predetermined numbers have no common measure so that an AND gate or the like inputting the two series of motor speed pulses puts out at least one pulse during each turntable revolution, with the output pulse being representative of a specific angular position of the turntable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.