BEMF timing system
US6754151B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 10, 2001 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Dec 9, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0946
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A system and method for controlling operation of a motor system that addresses the design challenges for the small form factor optical disk system. The control system can be operable to detect a first BEMF crossing and setting a first time stamp, to detect a second BEMF crossing and setting a second time stamp, to calculate a measured spin period as the difference between the first time stamp and the second time stamp, to compare the measured spin period to a reference spin period to determine a period error, to operate on the period error with a proportional gain and an integrator gain to provide a command output; and to drive a winding in the spin motor with a current to cause the spin motor to change velocity in response to the command output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.