Self-correcting sine and cosine encoder high-resolution position information splicing method

Abstract

The invention provides a sine and cosine encoder high-resolution position information splicing method capable of self-correction, and solves the problem that the position information precision is nothigh due to the fact that jump points exist at signal boundaries of position subdivision information and period counting information due to different acquisition paths. The invention is realized through the following technical scheme: the method comprises the following steps: firstly, position subdivision information and period counting information are obtained; correcting the period counting information by utilizing the position subdivision information; firstly, judging and comparing the consistency of sine and cosine signal quadrants indicated by position subdivision information and period counting information; and correcting the quadruplicated frequency count value of the period count information according to a judgment result to obtain accurate period count information, and splicing the period count information with the position subdivision information to obtain high-resolution position information. The position information splicing method is high in precision, irrelevant to the running direction of the encoder and simple in processing.

Description

technical field [0001] The invention relates to a sine-cosine encoder, in particular to the problem of data splicing in the realization of the high-resolution position subdivision of the sine-cosine encoder. Background technique [0002] A photoelectric encoder is a sensor that converts mechanical geometric displacement into electrical signals such as pulses or digital quantities. It is widely used in industrial fields such as CNC machine tools, robots and servo control technology to obtain position and speed information. The encoder is the core functional component of the measurement system in the numerical control system, and its accuracy directly affects the control accuracy of the numerical control system. [0003] Early CNC systems used square wave signal encoders, but due to the limitation of the diameter of the code disc and the etching process, it is difficult for square wave signal encoders to meet the high precision requirements. The sine-cosine signal output by t...

AI Technical Summary

Problems solved by technology

[0007] However, due to the different acquisition channels of cycle counting information and location subdivision information, information delays are different. Direct splicing and summing through the above methods will make the location information at the boundary point of the signal cycle not monotonous, and there will be sudden jump points, so that the obtained high There is a problem with the resolution position information, which affects the control accuracy of the control system

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