Data processing method and system for absolute photoelectric axis angle encoder

Abstract

The invention discloses a data processing method and system for an absolute photoelectric axis angle encoder. The method comprises the steps of converting a current signal into a voltage signal through a current-limiting resistor for an original signal of the encoder; dividing the original signal into a precision code signal and a coarse code signal; enabling the precision code signal and the coarse code signal to directly enter a CPU with an AD converter; and measuring the amplitude values of the precision code signal and the coarse code signal through the CPU, performing calculation to obtain a precision code subdivision value and a coarse code binary angle of the encoder, finally performing conversion to obtain an angle value of the encoder and performing output. According to the data processing method provided by the invention, an amplifier, a comparator and a latch are not used, namely, the amplifier, the comparator and the latch are removed on the basis of a traditional data processing system in the data processing system provided by the invention, so that the circuit size of the data processing system is greatly reduced and the cost is saved.

Description

technical field [0001] The invention relates to the technical field of photoelectric shaft-angle encoders, in particular to a data processing method and system of an absolute photoelectric shaft-angle encoder. Background technique [0002] Photoelectric shaft encoder, also known as photoelectric angle position sensor, is a precision digital angle measurement system integrating light, mechanics and electricity. There are several concentric code tracks along the radial direction on the circular code disc of the absolute photoelectric shaft encoder, and each code track is composed of light-transmitting and opaque fan-shaped intervals. On one side of the code disc is a light source, and on the other side there is a photosensitive element corresponding to each code track, and each light source and photosensitive element are paired as a reading head. When the code disc is in different positions, each photosensitive element outputs a different current signal according to whether i...

AI Technical Summary

Problems solved by technology

[0004] figure 1 The encoder data processing system is relatively complex, and the miniaturization of the encoder cannot be realized. When the encoder is used for a period of time or the environment changes, the original input signal of the encoder may change, resulting in the amplified fine code and coarse code signal. If it deviates from the ideal range, the accuracy of the encoder will decrease, and even cause wrong code, which will make the encoder unusable, so the encoder signal needs to be calibrated regularly

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