High-precision rotating encoder and measuring method of high-precision rotating encoder

Abstract

The invention discloses a high-precision rotating encoder and a measuring method of the high-precision rotating encoder. The rotating encoder comprises an optical system, a round coding ring, a rotating shaft, a data collecting module and a DSP (digital signal processing) data processing unit, wherein the optical system comprises a plurality of light source modules uniformly distributed on the surface of the rotating shaft, the round coding ring and the rotating shaft are in coaxial arrangement, the round coding ring is provided with a plurality of opposite code ways on the inner side surface of the circular ring parallel to the axial line of the round coding ring, the gaps of photoelectric sensors of the opposite code ways are respectively identical, the round coding ring is also provided with a fixed zero position code way beside the opposite code ways, the fixed zero position code way consists of a photoelectric sensor, the fixed zero position code way and each opposite code way are respectively and independently connected with a data collecting module, and the data collecting module is connected with the DSP data processing unit. The high-precision rotating encoder and the measuring method of the high-precision rotating encoder have the advantages that measuring errors due to radial jumping can be avoided, the measuring precision is high, in addition, the anti-jamming and pollution-resistant capability is high, and higher reliability is realized. The high-precision rotating encoder and the measuring method can be widely applied to the field of rotating angle measurement.

Description

technical field [0001] The invention relates to the field of rotary encoders, in particular to a high-precision rotary encoder and a measuring method thereof. Background technique [0002] The motor of an AC servo motor is usually equipped with a photoelectric rotary encoder to measure the rotation angle of the motor. The photoelectric rotary encoder can obtain the rotation angle of the rotor to obtain the motor speed information, and the speed information can be fed back to the relevant speed control unit to accurately control the motor. At the same time, the movement displacement, speed, acceleration and other information of the actuator can be calculated indirectly. The positioning accuracy of the servo motor depends on the resolution of the encoder. Photoelectric rotary encoder is a sensor that converts the mechanical geometric displacement on the output shaft into pulse or digital quantity through photoelectric conversion. It is currently the most widely used sensor in...

AI Technical Summary

Problems solved by technology

However, increasing the value of n will definitely cause great difficulties in the production of code discs.

At the same time, the slight manufacturing error of the binary code disc will lead to the advance or delay of individual code channels, which will cause the error of the output signal

In addition, for the circular grating encoder disk, in order to improve the subdivision accuracy of Moiré fringes, the method of increasing the density of the grating lines or placing more photosensitive elements to achieve a higher subdivision of the signal is currently more common It is to describe 50-100 grating lines in the range of 1mm, but it is impossible to accurately place multiple photosensitive elements under a certain phase difference

[0004] In general, in the current technology, due to the limitation of the grating writing technology, the accuracy of the photoelectric rotary encoder is greatly limited.

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