Absolute code disc coarse code correction method

An absolute and code disc technology, applied in the field of photoelectric sensors, can solve the problem of discontinuous angle values ​​of absolute code discs, etc.

Active Publication Date: 2020-04-28
LUOYANG WEIXIN ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Absolute code disc coarse code correction method
  • Absolute code disc coarse code correction method
  • Absolute code disc coarse code correction method

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Embodiment 1

[0089] A method for correcting coarse codes on an absolute code wheel is characterized in that an absolute code wheel is used, and the steps are as follows:

[0090] (1) The design and installation of the absolute code disc finally make the absolute code disc have the following structure:

[0091] The absolute code wheel involved includes a housing 1 , a shaft 21 system structure, a light emitting lamp board 3 , a main grating 4 , a sub grating 5 and a signal processing board 6 .

[0092] The housing 1 includes an upper housing 11, a lower housing 12 and an elastic coupling 13; the upper housing 12 is fixed on the upper part of the shafting structure, the elastic coupling 13 is installed on both sides of the upper housing 11, and the lower housing 12 is fixed on The lower part of the bearing seat 23 forms a hollow housing 1; the shafting structure, the light emitting lamp board 3, the main and auxiliary gratings 5 ​​and the signal processing board 6 are all installed inside th...

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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...

Claims

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Application Information

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IPC IPC(8): G01D18/00
CPCG01D18/00
Inventor 徐家庆王国锋牛宏扬张零峰杨靖兰郭晓文梁允
Owner LUOYANG WEIXIN ELECTRONICS TECH
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