Error compensation device for sin/cos encoder

Abstract

The invention discloses an error compensation device for a sin / cos encoder, belongs to a digital signal error compensation device, solves the problem that the conventional error compensation system requires a special error tester and is used for compensating and correcting various errors of output signals of the sin / cos encoder. The error compensation device comprises a differential amplifier, an analog-digital (AD) conversion circuit, and a direct current error compensation module, an amplitude error compensation module and a phase error compensation module which are connected in series in turn. The direct current error compensation module and the amplitude error compensation module eliminate direct current errors and amplitude errors in the output signals of the encoder in turn, and input a processing result to the phase error compensation module; and the phase error compensation module converts phase errors into direct current errors and amplitude errors through phase shift and a frequency multiplier, and compensates the direct current errors and the phase errors to obtain two paths of ideal high-quality sinusoidal / cosine signals. The device is easy and convenient to implement, and good in use effect and provides a basis for reducing interpolation errors and improving interpolation accuracy and resolution.

Description

technical field [0001] The invention belongs to a digital signal error compensation device, in particular to an error compensation device of a sin-cosine encoder, which corrects and compensates the DC error, amplitude error and phase error of the output signal of the sin-cosine encoder. Background technique [0002] Sine and cosine encoders include rotary encoders, linear grating scales, circular gratings, rotary transformers or ball scales, which can output sine and cosine signals representing angles and positions, and are widely used in the field of high-precision motion control. Users can extract high-resolution position information from the sine-cosine signal output by the sine-cosine encoder through a suitable interpolation method, and this sine-cosine signal has a single frequency component, which can transmit a longer distance than a square wave without attenuation or distortion. [0003] Extracting positional information from sine-cosine signals is often referred to...

AI Technical Summary

Problems solved by technology

[0012] The invention provides an error compensation device for a sine-cosine encoder, which solves the problem that the existing error compensation system needs a special error testing instrument, and compensates and corrects various errors of the output signal of the sine-cosine encoder to provide ideal sine signals and ideal cosine signal

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