We all know that a rotary encoder is a device that encodes and converts signals or data into a form that can be used for transmission, communication and storage. So for the common type of encoder and the method of use is to be known, in use process, of course, also need to do in order to understand matters needing attention of encoder, because in the use of the encoder are prone to common faults, in order to make customers to be able to have a further understanding of our products, below small make up is simple for everyone on the analysis of the working principle of the rotary encoder.

 

   Encoders can be divided into absolute and incremental types depending on how they work. Each azimuth of the absolute encoder corresponds to a certain digital code, so its indicating value is only related to the starting and ending azimuth of the measurement, and has nothing to do with the intermediate process of measurement. The incremental encoder converts the displacement into periodic electrical signals, which are then converted into counting pulses, and the magnitude of the displacement is expressed by the number of pulses.

 

   Working principle of rotary encoder

 

   Encoder code disc material with metal, glass, plastic, glass encoder is in the deposition of thin scribed line on the glass, its high accuracy and good thermal stability, metal encoder directly to pass and impassability scribed line, not easy to be broken, but because has certain thickness of metal, precision so there is a certain limit, its thermal stability is an order of magnitude worse than glass, plastic encoder is economical, Because of its low cost, so the thermal stability, accuracy, life are worse.

 

   Rotary encoder is by A central shaft of light code disc, on which there are circular and dark scribed line, have read photoelectric emission and receiving devices, obtain four groups of sine wave signal into A, B, C, D, each phase sine wave by 90 degrees, will reverse, C, D signal superimposed on A, B two phase, can enhance the stability of signal; In addition, a Z pulse is output per revolution to represent the zero reference bit. Since A and B are 90 degrees apart, the forward and reverse rotation of the encoder can be determined by comparing whether A is in the front or B is in the front. The zero-bit reference bit of the encoder can be obtained through zero-bit pulse