Absolute position detection within 1 revolution using 3-channel incremental encoders with high resolution track
US5998784A · kind A · utility
6Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1998 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | May 8, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2455
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The quasi-absolute encoder module determines absolute position within one mechanical rotation. The encoder module includes a three channel position encoder and detection circuitry that includes a read-only memory (ROM). There are three channels: A, B, and I. Channels A and B have four periods and channel B is offset from channel A by 90.degree. in phase. Channel I has a unique sequence. The address generated by sampling this unique sequence corresponds to an address in ROM. The address indicates the position of the rotating shaft on which the code wheel is attached.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.