Research on the analog-to-digital hybrid square wave encoder signal error compensator

Abstract

Photoelectric encoders are important electronic components, widely used in motion control systems, position measurement systems, and can measure angular displacement or displacement with high accuracy. Encoders widely used today output analog sine waves or digital square waves. The resolution of the encoder determines the measurement accuracy of the encoder, because the sine wave encoder can be more easily subdivided, which gradually replaces the square wave encoder in many occasions, but the square wave encoder is still widely used in the system with low demand for accuracy and low cost. The prerequisite for high subdivision of the output of the square wave encoder is good signal quality. Through the study of the signal output by the ideal encoder, this paper proposes the characteristics of distinguishing the error signal from the ideal signal, divides the error into two categories, designs a filter with two steps to compensate separately, and uses Simulink to establish a simulation model for verification.