The principle and advantages and disadvantages of absolute encoder

Absolute encoder

1.Absolute pulse encoder disc is an absolute angular position detection device. Its position output signal is a digital signal of a certain standard. It indicates the absolute position reached after displacement. The digital signal of the absolute position of the start and end points is used. , The magnitude of the displacement can be obtained after calculation.

2.There are three parts of the structure, rotating code disc, light source and optical sensor. Optical code channels, each code channel is distributed with transparent and opaque areas according to a certain rule.

　　 3. Principle

　　The light from the light source passes through the optical system, passes through the light-transmitting area of the code wheel, and is received by the photosensitive element behind the slit, and the output is "1"; if it is blocked by the opaque area, the photosensitive element outputs "0". The output code combination of each code channel represents the corner position of the code wheel.

　　4, the advantages and disadvantages of absolute code disc

　　 Advantages:

　　 (1) High precision, no contact, long life

　　 (2) No need to find zero after booting

　　 (3) No cumulative error

　　 (4) No counter is required, and the allowable speed is high.

　　 Disadvantages:

　　 (1) Complex structure and large volume

　　 (2) expensive

　　 5. Precautions for use

　　 1. The power supply must be reliable and pay attention to the voltage drop during long-term transmission

　　2, consider the handling of errors

　　3, consider the processing of zero crossing