A three-channel encoder subdivision and position information acquisition device with the synchronization function of the test piece

Abstract

The present invention provides a device of three-channel encoder refinement and positional information acquisition with a tested piece synchronization function. The device provided by the invention comprises a FPGA chip and a difference-to-single end module, an analog-digital conversion module, a dual-way RS-42A module, an EnDat interface module and a PCI interface module which are connected with the FPGA chip; the difference-to-single end module is configured to convert differential signals inputted by an incremental sine and cosine encoder to single-end signals so as to facilitate the further processing of subsequent analog-digital conversion modules; the analog-digital conversion module is configured to convert the sine and cosine analog signals at the single end of the encoder to digital signals capable of being processed by a digital circuit through data sampling so as to perform data processing of subsequent digital circuits; the dual-way RS-42A module is configured to connected with a computer or a DSP and output triaxial data and the tested piece data to subsequent electronic devices according to the RS-422A serial standard; the EnDat interface module is configured to connect with subsequent devices with the EnDat interface and output the triaxial data and the tested piece data to subsequent electronic devices according to the EnDat interface standard; the PCI interface module is configured to connect with the PCI expansion interface of the computer to allow the computer to steadily obtain data at a high speed and facilitate subsequent data processing and storage.

Description

technical field [0001] The invention relates to a three-channel encoder subdivision and position information acquisition device with a synchronization function of the test piece, which can be applied to a numerical control system to improve the accuracy of the control system, provide position information for the control unit, and collect and encode for the computer. Synchronization between the encoder and the test piece in the field of encoder data and testing belongs to the technical field of sine-cosine encoder subdivision, encoder position information collection and numerical control system. Background technique [0002] In the measurement and control process of numerical control and industrial control systems, encoders are the most commonly used closed-loop feedback devices. The accuracy of encoder information collection and information transmission speed determine the response speed and accuracy of the entire system to a large extent. The types of encoders are mainly di...

AI Technical Summary

Problems solved by technology

But this processing method mainly has the following three shortcomings: the first, the resolution of the encoder has not been improved, and the system control accuracy has not been improved; the second, using DSP to collect and process data will affect the CPU (central processing unit) Real-time control of the entire system; third, it can only be used on specific products and cannot be applied to other control systems

The method of hardware subdivision mainly uses the comparator circuit to compare the reference level and the signal level of the encoder to obtain subdivision data, but this method is complex to implement, has low flexibility, and the accuracy of subdivision cannot be guaranteed.

Software subdivision usually uses DSP or MCU (microprocessor) to add ADC (analog-to-digital conversion) and other related peripheral circuits to run related subdivision algorithms to obtain subdivision data. However, compared with hardware, the speed of software subdivision method is slowed down, and High CPU usage

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