A Method of Absolute Code Wheel Coarse Code Correction

Abstract

The invention introduces a method for correcting the coarse code of the absolute code disc, which adds a circle of correction code tracks to the design of the grating; the parallel light of the absolute code disc passes through the grid of the main grating, and then passes through the light-transmitting slit of the sub-grating , when rotating, the signal receiving unit of the signal processing board detects the change of luminous flux, and collects 12 channels of coarse codes, 2 channels of correction codes, and 4 channels of fine codes, and performs an addition operation on the fine codes, coarse codes, and correction codes to obtain an odd number , then skip the number function; if an even number is obtained, it needs to be corrected. When the fine code 90°=0, perform "+" correction; when the fine code 90°=1, perform "-" correction, thus realizing the coarse code correction . The invention solves the problem of discontinuous angle value in the synthesis process of coarse code and fine code, and can quickly and accurately complete the measurement of the angle of the measured shaft system; the use of the correction code can correct the positive and negative of the coarse code signal at the moment of power-on , Solve the problem of data jump after power-on, reduce the requirements for assembly accuracy, and reduce the difficulty of assembly.

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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