How the encoder works

Programmable Package SG-8018CA(SG7050C) 0.67M~170M

Photocoupler

Introduction: Encoder is an instrument that can be used for coding. So the question is, what is the working principle of the encoder ?↓↓↓

First, the working principle of the encoder - - Introduction

The encoder, whose English name is encoder, is a device that converts signals. The encoder converts an angular displacement or a linear displacement into an electrical signal. We refer to the former as a code wheel and the latter as a code rule. Encoders can be divided into incremental encoders and absolute encoders according to different working principles. Wherein, the incremental encoder first converts the displacement into a periodic electrical signal, and then converts the electrical signal into a counting pulse, and finally uses the number of pulses to represent the magnitude of the displacement; and each position of the absolute encoder corresponds to one The determined digital code, whose final result is only related to the measured start and end points, is independent of its intermediate process.

Second, the working principle of the encoder - - classification

Encoders can be divided into contact encoders and non-contact encoders according to different readout modes; they can be divided into voltage output encoders, open collector output encoders, push-pull complementary output encoders and long-line drivers according to different signal output types. Output encoder; according to the mechanical installation form of the encoder can be divided into shaft type encoder and sleeve type encoder; according to the working principle of the encoder can be divided into incremental encoder and absolute encoder.

Third, the encoder works

The encoder has a photoelectric code disc with a shaft at the center, and the photoelectric code disc contains a circular pass and a dark engraved line. The scale value is read by the photoelectric emitter and the photoelectric receiver, and four sets of sine wave signals are read (A, B). , C, D), each sine wave phase is 90 degrees out of phase, that is, the period is 360 degrees. The two sine wave signals of C and D are reverberated and superimposed on A and B to enhance the stable signal. In addition, a Z-phase pulse is output per revolution to represent the zero reference position. Since the phases of the two sine waves of A and B are 90 degrees apart, it can be judged whether the encoder is forward or reverse by comparing the positions of the two sine waves of A and B; the zero reference position of the encoder can be obtained by the zero pulse.

How the encoder works