Resonant motor driver system for data reading
US6547145B2 · kind B2 · utility
8Cited by
14References
43Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 1999 |
| Grant date | Apr 15, 2003 |
| Priority date | — |
| Expiry date | Sep 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/10643
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A method for driving a resonant electromagnetically-actuated motor, such as those used to scan a light source for date reading applications, wherein drive current is applied when the back-EMF induced in the actuator coil is zero and has a specific slope, and that drive current is removed after the induced back-EMF voltage has changed by a predetermined constant value. The drive circuit will drive the motor across a scan angle which remains substantially constant regardless of changes in ambient temperature, changes in motor orientation, or externally applied forces.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.