Absolute encoder is a high-precision sensor used to measure motion position. It can realize high-precision position, speed and acceleration measurement in mechanical systems, and is widely used in machining, automation control, robotics, medical equipment and other fields. This article will introduce the principle of absolute encoder, the use of methods and precautions.
Principle
Absolute encoder converts position information into digital signal output by measuring the position of rotary or linear motion. It consists of two parts: the readhead and the scale. The scale is usually a grating, consisting of a series of thin lines parallel to each other, each with a fixed width and pitch. As the scale moves in the direction of motion, the readhead detects the lines on the encoder and calculates position information based on the position and pitch of the lines. Absolute encoders can achieve position resolutions of up to 0.1 microns with an accuracy of up to 0.01%.
How to use
The following steps are required to use an absolute encoder:
1. Mount the scale. The scale needs to be fixed to the moving part so that it moves in the direction of motion. The mounting position and orientation of the scale needs to be determined according to the specific application scenario.
2. Install the readhead. The readhead needs to be installed on the fixed parts, so that it and the ruler to maintain a certain distance, and to ensure that there is no interference between the readhead and the ruler.
3. Connect the signal line. Connect the output signal line of the readhead to the digital signal processor or controller in order to process and display the position information.
4. Calibration. The absolute encoder needs to be calibrated before use to ensure that its output position information is accurate.
Precautions
The following things need to be noted when using absolute encoders:
1. Avoid interference. Absolute encoders need to maintain a certain distance between the readhead and the scale, and ensure that there is no interference between the readhead and the scale. Otherwise it will affect the accuracy of the position information.
2. Avoid vibration. Absolute encoder is very sensitive to mechanical vibration, need to avoid mechanical vibration during installation. If it can not be avoided, vibration isolation measures can be used.
3. Regular maintenance. Absolute encoders need to be cleaned and maintained on a regular basis to ensure that they work properly.