A high-speed signal acquisition and subdivision method and system for a sine-cosine encoder

Abstract

The invention relates to a high-speed signal acquisition and subdivision method and system of a sin-cos encoder, which is used for measuring and calculating the rotation angle of a high-speed and high-precision sin-cos encoder. First, a high-speed digitizer is used to collect and process the high-speed signal of the sin-cos encoder , using the Kalman filtering algorithm to denoise, and obtain two digital signals with a phase difference of 90 degrees. After being stored in the high-speed streaming disk, the upper computer software of the industrial computer processor performs arctangent software subdivision, and respectively passes through the signal starting point phase angle calculation module. , a half-period interception and counting module, a signal terminal phase angle calculation module, and finally calculate the precise value of the encoder rotation angle.

Description

【Technical field】 [0001] The invention belongs to the field of signal detection and processing, and in particular relates to a high-speed signal acquisition and subdivision method and system of a sine-cosine encoder. 【Background technique】 [0002] In the servo and precision measurement and control systems with high precision and high dynamic performance requirements, the position and speed of the rotor must be measured in real time and accurately. position and speed measurement provides a technical solution. [0003] Sin-cosine encoders have been widely used in robots, precision machine tools, testing equipment and other systems. With the continuous improvement of the performance requirements of control and measurement systems, the requirements for positioning accuracy and angle measurement accuracy of the rotating shaft position are also getting higher and higher. Then high-speed signal acquisition and processing is very important. However, simply increasing the number o...

AI Technical Summary

Problems solved by technology

The hardware subdivision method achieves subdivision through the comparator circuit, which has the disadvantages of complex circuit, high cost, and poor flexibility; the software subdivision method generally uses DSP or FPGA processors to perform AD sampling conversion on the sine and cosine signals of the encoder. The impact of speed can only be subdivided according to the amplitude or phase. This kind of processor has relatively slow operation speed and weak pulse processing ability, which cannot meet the subdivision requirements of high-speed signals.

Moreover, in order to reduce the computational complexity, most of the existing software subdivision algorithms of sine-cosine encoders use linear approximation or other approximation methods, which limits the accuracy of measurement and control system applications to a certain extent.

Images