A kind of photoelectric encoder precision speed measuring system and method

Abstract

A photoelectric encoder precision speed measurement system and method, the system includes: a connecting bracket, a DC motor, a data acquisition and control circuit, a motor drive circuit, a computer with a display device and a photoelectric encoder; the computer is used to send data to the data acquisition and control circuit Send the start command; the data acquisition and control circuit is used to control the motor drive circuit to drive the DC motor to rotate according to the start command; the DC motor is used to drive the photoelectric encoder to rotate synchronously; The generated Moiré fringe signal is used to obtain the angle data of the position of the photoelectric encoder, and the angle data is calculated according to the preset formula to obtain the speed information of the photoelectric encoder, and output to the computer for display. The invention realizes the high-precision speed measurement of the photoelectric encoder, avoids the influence brought by the subdivision error and the limitation of the sampling frequency by the frequency of the output signal, and effectively improves the speed measurement accuracy of the photoelectric encoder.

Description

technical field [0001] The invention relates to the technical field of photoelectric encoders, in particular to a photoelectric encoder precision speed measurement system. Background technique [0002] Photoelectric encoder is a kind of photoelectric angular displacement sensor integrating light, machine and electricity. By converting the spatial angular position information detected by the metering circular grating into corresponding digital code output, it can be uploaded to computer equipment to realize digital measurement and dynamic control. In the field of motor speed measurement, photoelectric encoders are widely used because of their high measurement accuracy, strong anti-interference and high resolution. [0003] The photoelectric encoder speed measurement methods of traditional encoders include M method, T method and M / T method. On this basis, variable M method, variable T method, and variable M / T method are derived; At least the speed of the encoder is directly ...

AI Technical Summary

Problems solved by technology

[0003] The photoelectric encoder speed measurement methods of traditional encoders include M method, T method and M / T method. On this basis, variable M method, variable T method, and variable M / T method are derived; At least the speed of the encoder is directly measured, and the position information output by the encoder is obtained, and then the speed information is obtained through a certain algorithm. This will cause the speed measurement result to be affected by the signal processing delay of the encoder, and the sampling frequency is low.

Secondly, the speed measurement algorithm cannot meet the error requirements in the entire speed measurement range. For example, the M method speed measurement is suitable for high-speed measurement, and the error is large at low speeds. The T method is the opposite.

In addition, the development of modern control theory also puts higher requirements on the accuracy of modern control systems, which poses a challenge to the measurement accuracy of encoders.

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