Absolute position identification method for incremental photoelectric encoder

Abstract

The invention discloses an absolute position identification method for an incremental photoelectric encoder, and relates to a photoelectric encoder of moire fringes. The problems of high requirementson use environment, poor environmental adaptability, poor stability and the like of the existing identification method are solved. The method comprises the following steps: dividing the pattern of a photoelectric encoding disc into two encoding rings, wherein the outer ring is a fine code encoding ring for generating the moire fringes, and the inner ring is an absolute position encoding ring; respectively inserting reference points at four positions of 0 DEG, 90 DEG, 180 DEG and 270 DEG of an absolute position code channel, wherein three groups of the reference points are inserted at each position, the numbers of the precise code scribed lines among the three groups of reference points at the 0-DEG position are n1 and n2 respectively, the number of the fine code scribed lines among the three groups of reference points at the 90-DEG position is n3 and n4 respectively, the number of the fine code scribed lines among the three groups of reference points at the 180-DEG position is n5 and n6 respectively, and the number of the fine code scribed lines among the three groups of reference points at the 270-DEG position is n7 and n8 respectively; and when the encoding disc rotates to completely penetrate through three groups of reference points at any position, obtaining an absolute position. According to the method, the environmental adaptability and stability of the encoder are improved.

Description

technical field [0001] The invention relates to a photoelectric encoder for Moiré fringes, in particular to an absolute position recognition method for an incremental photoelectric encoder. Background technique [0002] Moiré fringe photoelectric encoder, it is a digital angle measuring device integrating light, mechanics and electricity. From the encoding method, it can be divided into three types: incremental, quasi-absolute and absolute. Among them, the quasi-absolute type adds multiple reference points on the basis of the incremental photoelectric encoder disc to improve the efficiency of finding the absolute position. It is similar to the incremental angle measurement mechanism and signal processing method, and can also be attributed to It is an incremental optical encoder. Incremental photoelectric encoders are widely used because of their simple structure, fast response and reliable operation. [0003] At present, the main absolute position recognition methods of i...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides an absolute position identification method of an incremental photoelectric encoder to solve the problems of the existing identification methods, such as high requirements on the use environment, poor environmental adaptability, poor stability, etc.

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