The principle of absolute encoder

There are many optical channel lines on the optical code disk of the absolute value encoder, each line is arranged in 2, 4, 8, and 16 lines in sequence. In this way, at each position of the encoder, by reading the on and off of each line, a unique set of binary codes (Gray codes) from the zero power of 2 to the n-1 power of 2 are obtained, which is called an n-bit absolute encoder.

Gray code belongs to reliability coding and is a coding method that minimizes errors. Because, although natural binary codes can be directly converted into analog signals by analog-to-digital converters, in certain situations, such as converting from decimal 3 to 4, each bit of the binary code needs to change, which can generate large spike current pulses in digital circuits. Gray codes, on the other hand, do not have this drawback. When converting between adjacent bits, only one bit undergoes a change. It greatly reduces logical confusion when transitioning from one state to the next. Due to the fact that there is only one digit difference between two adjacent code groups in this encoding, when there is a small change in the direction's corner displacement to digital quantity conversion (which may cause a change in the digital quantity), the Gray code only changes one digit. This is more reliable compared to other encodings that change two or more digits simultaneously, and can reduce the possibility of errors.

The difference between single turn and multi turn absolute encoders

The so-called single turn and multi turn encoders refer to absolute encoders, which can sense the current absolute angular position at any time, especially when just powered on. A single circle can only perceive the absolute angular position within one circle; Multi turn not only can sense the absolute angular position within one turn, but also can sense how many angles the encoder has rotated since its use. The absolute encoder is determined by the mechanical position to determine the uniqueness of each position.

The characteristics of absolute encoders

1. No need for memory, no need to find reference points, with power-off memory function

2. Multiple communication protocols

3. Quick start speed and precise multi axis motion control

4. Anti interference characteristics and corrosion resistance

5. High precision, high stability, and high reliability

The shell material of absolute value encoders has many advantages. Absolute value encoders have better performance in strength control and corrosion resistance. Excellent material performance is the foundation of equipment environmental adaptability. For users, when purchasing corresponding absolute value encoders, they can first choose suitable machine equipment from the material of the equipment. Of course, there will be more outstanding performance indicators such as data processing speed, and excellent workmanship and performance will ensure the performance of the absolute value encoder.

Shenzhen Zhongling Technology, as a long-term R&D enterprise focused on products, has recently launched the latest absolute value encoder hub motor, bringing customers higher quality products and solutions, and promoting industry progress.