High accuracy optical shaft encoder system
US4224515A · kind A · utility
14Cited by
1References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1978 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Oct 27, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An optical shaft encoder system for measuring electrically powered motor shaft speed, including a system for increasing the sinosoidal encoder output waveforms by a multiplication factor, converting the product of the multiplied waveforms to square waves, comparing the waveforms to a reference waveform and generating a correction signal which is fed back to the motor through servo circuitry, thereby correcting errors in motor shaft rotational speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.