Patent ID: 6642684
Filing Date: 2003-11-04
Classification: G01D

Abstract:
A system for controlling a positioning apparatus, comprising:a) an incremental position measuring device for providing analog output signals of the form sin &phgr;1, sin (&phgr;1Â±p), p being an angle by which the two output signals are phase-shifted, b) a control unit for converting the output signals into control signals for controlling the positioning apparatus, and c) mixing means for mixing a correction angle &phgr;2 into the output signals, the mixing means being connected between the incremental position measuring device and the control unit in such a way that the output signals obtain the form sin (&phgr;1Â±&phgr;2), sin (&phgr;1Â±&phgr;2Â±p) before they are converted into control signals by the control unit, the mixing means accessing at least one correction angle table in which values of the correction angles &phgr;2 or their trigonometric equivalents to be taken into account for specific situations are stored.