UP-TO-DATE TECHNIQUE FOR EASY HIGH-ACCURACY POSITION ACQUISITION WITH SINUSOIDAL INCREMENTAL ENCODERS

Abstract

Currently known methods for high-resolution position acquisition with sinusoidal incremental encoders (i.e. VeCon) always require additional hardware components for counting whole cycles, two AID-converters for quantifying the position within the current cycle and a routine for synchronising both information. The presented method uses only the information of the two AID-converters with a relatively simple procedure. The most important fact is that the position may be calculated even at a rotation speed, where the fundamental frequency of the encoder signals exceeds the sampling frequency by a multiple value, so that the sampling theorem may be violated. The paper discusses the development of this technique, the implementation of an additional error detection method, a practical application as well as experimental results.