Method and apparatus for detecting positions and/or speed of a moving body using two phase signals
US5019773A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Aug 22, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/246
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Sine wave signals generated from a position detector are used as analog values to detect a fine position of a rotating or moving body, a rise or fall edge of the sine wave signal is used to detect a coarse position of the rotating or moving body, and the position or speed of the rotating or moving body is detected based on a signal indicative of the detected coarse position when the rotating or moving body is at high speed and based on a signal indicative of the detected fine position when the rotating or moving body is at low speed to thereby provide optimal control from high speed to low speed. Especially at extremely low driving, speed detection with superhigh resolution is effected using the analog value to decrease an uneven rotation of the rotating body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.