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What are the position of the motor encoder?

by:HENGXIANG     2020-11-26
What are optical introduced the position of the motor encoder? Motor position encoder is widely used in servo driver, robots, machine tools, printing presses, textile machine motor and elevator industry control application. Using interface connects the encoder to the rest of your system will bring some tricky electromagnetic compatibility ( EMC) The problem. According to the required position/Angle resolution industrial drive applications, from a few to 25 or more than 25. Some drive applications even need rotation angles. Distance from the transducer to the installation of position encoder will be different, from very short a few meters ( In the multi-axis drive) To more than 100 m or 100 m. Due to the long distance, electrical interface has been designed, in order to realize the electromagnetic field, the common-mode voltage, impulse noise robust data transmission with high interference. There are two types of position encoder: incremental position encoder and absolute position encoder. Incremental encoder can provide information about incremental position or Angle changes. They do not provide absolute position after electricity, but is still possible to after a mechanical rotating by index signal. Absolute encoder can always provide absolute mechanical position. Incremental encoder can display three difference signal, A signal, B signals and Z. A signal and B signal coding for incremental position change. Position resolution depends on incremental encoder line number. The typical line number range is turn every 50 to 10000 line. Z signal usually comes once every move, is used to derive the absolute position of 'origin index ( homeindex) ”。 Incremental encoder interface is a transistor Transistor logic ( TTL) Or high threshold logic ( HTL) Compatible with digital output level of the digital pulse sequence or with 1 VPP or 11 mu App simulation sine/cosine output amplitude. With analog output of the encoder is often referred to as sine/cosine encoder, allow this kind of encoder resolution than with TTL/HTL output the resolution of the encoder to allow much higher, because you can through the use of the measured sine and cosine signal of the arctangent function inserts its position within a line number. The interpolation can increase the resolution of 16 bits, possible total resolution of 25 or more. Line number of the selected encoder multiplied by the rotation speed and the frequency of the output signal is proportional to the. Absolute position feedback can provide absolute position encoder ( Resolution of 25 or more than 25) 。 Their electrical interface from serial interface based on analog and digital mixed protocol evolved into serial interface based on pure digital protocol. Serial communication standard is usually a vendor specific, and can use RS - through the bidirectional data transmission Or RS - 485 422 differential signal. For example, EnDat2. 2 can transfer not only absolute position, but also allow the read data from a memory of the encoder or writing data to the memory of the encoder. Through subsequent electronic equipment ( Is often called EnDat2. 2) the main Send to EnDat2. 2 encoder mode command, you can choose the type of data being transmitted - — Absolute position, rotation number, temperature, more parameters, the diagnostic data. Shanghai optical co. , LTD. Is a collection of industrial encoder and high precision coupling of research and development, manufacture and sales for the integration of high-tech enterprises, the main products are encoder and coupling, anchor displacement sensor. A: what is the working principle of the servo motor encoder? Next article: how to detect the numerical control equipment of rotary encoder failure?
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