Rotary Grating Encoder Acquisition and Measurement Device

Abstract

The embodiment of the present invention discloses a rotary grating encoder acquisition and measurement device, which includes a light source module for emitting light to the rotary grating encoder, a rotary grating encoder arranged on the rotating shaft of the machine to be tested and rotates synchronously with it, an image acquisition module and Signal processing module. The rotary grating encoder includes the main composite code track arranged on the outer circumference and the secondary composite code track of the code disc. The main and secondary composite code tracks both include absolute code tracks and incremental code tracks; light, and generate the main and auxiliary absolute code channel images and the main and auxiliary incremental code channel images; the signal processing module calculates the main rotation angle value according to the main absolute code channel image and the main incremental code channel image; Calculate the auxiliary rotation angle value from the image of the measuring code track; determine the rotation angle value of the machine under test from the main rotation angle value and the auxiliary rotation angle value according to the main shaft movement, which improves the angle measurement accuracy of the rotary grating encoder in a high-speed working environment .

Description

technical field [0001] Embodiments of the present invention relate to the technical field of angular position measurement, and in particular to a rotary grating encoder acquisition and measurement device. Background technique [0002] With the rapid development of industrial automation technology at home and abroad, the angular position measurement of rotating equipment is very important in the entire industrial control field, and the performance requirements of encoders as position measurement sensors in servo drive systems are also getting higher and higher. [0003] The absolute photoelectric shaft encoder has been widely used in the field of rotation angle measurement due to its fixed zero point, strong anti-interference ability, no need to re-calibrate after power failure, and no cumulative error. [0004] The related art generally adopts a ring structure to develop a new type of absolute photoelectric shaft encoder, such as a rotary grating encoder, to be applied in th...

AI Technical Summary

Problems solved by technology

However, when the rotary grating encoder rotates at high speed with the machine under test, there will be radial and axial instability when the rotary grating encoder is installed on the main shaft, which will cause measurement errors, resulting in the measurement of the rotation angle of the machine under test. low precision

In addition, the traditional annular absolute photoelectric shaft encoder must sacrifice accuracy in order to achieve miniaturization

Images