Chinese independent research and development of the core technology of photoelectric encoder has made a breakthrough

The reporter learned from the China High-tech Industrialization Research Association today that the industry expert group led by the academician of the Chinese Academy of Engineering, You Zheng, has determined that my country’s self-developed high-precision absolute rotary photoelectric encoder core chip and related technologies are the first in China and reach the international advanced level. .

According to reports, the rotary photoelectric encoder is a sensor that uses the photoelectric principle to obtain the rotation angle change of the rotating shaft. It integrates optics, electronics and precision mechanical technology. It is widely used in elevators, robots, drones, CNC machine tools, and engraving machines. , Medical equipment, etc., are high-end control sensor equipment that is indispensable in the intelligent manufacturing process.

According to the technical staff of Beijing Zhongwei Ruixin Technology Co., Ltd., the core chips of rotary optical encoders are currently heavily dependent on imports, and most of the high-end products of domestic encoder manufacturers use German and Japanese overall solutions.

It is understood that the team independently developed the core technology of the photoelectric encoder. The rotary photoelectric encoder chip is composed of a photodiode array, a high-precision low-noise operational amplifier, a second-stage fixed gain amplifier and a hysteresis comparator with backlash. Reached 23 places. The chip integrates miniature 3-channel optical vernier coding technology and real-time light intensity calibration technology, which can eliminate the influence of environmental factors such as LED luminescence with temperature changes, LED aging, oily dust on the encoder, and poor surface cleanliness of the detector. , Improve the repeatability and positioning accuracy of the encoder.

The team also invented a new split-encoder structure, and derived a new split-encoder calibration method and installation method from this structure, reducing the difficulty of operation during the calibration and installation of the split-encoder, and significantly reducing the points. The overall thickness of the integrated encoder saves the installation space of the encoder.

Encoder structure diagram