Absolute code disc coarse code correction method

Abstract

The invention discloses an absolute code disc coarse code correction method. A circle of correction code channel is added to a grating design; parallel light of the absolute type code disc penetratesthrough grids of a main grating and then a light-transmitting slit of an auxiliary grating, and changes of luminous flux are detected by a signal receiving unit of a signal processing board during rotation; 12 paths of coarse codes, 2 paths of correction codes and 4 paths of fine codes are collected respectively, and the fine codes, the coarse codes and the correction codes are subjected to addition operation to obtain odd numbers and hop count functions; if an even number is obtained, correction needs to be performed, and when the fine code 90 degree is equal to 0, ''+'' correction is performed; and when the fine code 90 degree is equal to 1, '' ''correction is performed so that coarse code correction is realized. In the invention, a problem of discontinuous angle values in a coarse codeand fine code synthesis process is solved, and measurement of an angle of a measured shafting can be quickly and accurately completed; and by using the correction code, positive and negative correction can be performed on the coarse code signal at a moment of power-on, the problem of data bounce after power-on is solved, a requirement for assembly precision is reduced, and assembly difficulty isreduced.

Description

technical field [0001] The invention relates to the technical field of photoelectric sensors, in particular to a method for correcting coarse codes on an absolute code disc. Background technique [0002] Absolute code disc outputs absolute shaft angle position information, the reading is reliable, and has absolute zero position, and the absolute angular position information can be obtained without recalibration after power off, and there is no accumulated error. [0003] Absolute code discs generally adopt a matrix code channel design. The collected Gray codes A1~Am are converted into natural binary codes X1~Xm through an algorithm. Affected by other factors, the coarse code cannot form a continuous natural binary code with the fine code, so a correction link is required to connect the coarse code and the fine code into a continuously changing natural binary code. According to the conversion characteristics, all the end faces of the lowest point Xm code are exactly the same...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for correcting the coarse code of the absolute code wheel to solve the problem of discontinuous angle value of the absolute code wheel in the process of synthesizing the coarse code and the fine code, and to complete the correction of the measured axis. Accurate and real-time measurement of system angle, and output the angle data in RS422 asynchronous serial mode

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