Position detecting apparatus using offset calculated from sum of three-phase signals
US5663643A · kind A · utility
6Cited by
1References
7Claims
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Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Sep 2, 1997 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E40/50
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A position detecting apparatus for a scale measuring system executes a offset correction of the detected three-phase signals A, B and C by using the arithmetic mean (A+B+C)/3 as an offset value. Further, the apparatus executes a gain correction of the offset corrected signals by using a gain which is obtained by the calculation of a square-root of {A.sup.2 +(B-C).sup.2 /3}. Therefore, the accurate measurement is executed by this apparatus even if the gain level is changed at a turn-on of an electric source of this apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.