Research On The Compensation Strategy For Delay And Deviation Of The Magnetoelectric Sine-cosine Encoder

With the development of the servo industry,as a main component of the servo motor,the encoder has become more and more important in high-precision applications.For industries that require high processing accuracy and low production cost,such as the wood processing industry and the textile industry,although the accuracy of the photoelectric encoder can meet the processing requirement,the cost is too high.The magnetoelectric sinecosine encoder can obtain a high-precision rotor angle through reasonable deviation compensation and subdivision of the sine-cosine signal,compared with the photoelectric encoder,its cost is lower and it can meet the accuracy requirements of the textile industry,so it has a good development prospect.First of all,this thesis designs the sine-cosine signal’s generation circuit,differential amplifier circuits and other hardware circuits according to the working principle of the magnetoelectric encoder.In consideration of the calculation accuracy and the time consumption of each subdivision algorithm,the CORDIC algorithm was selected to subdivide the sine-cosine signal.Secondly,the influence of the sampling delay between the sine signal and cosine signal on the encoder’s accuracy is analyzed.Based on this,a new sampling strategy is proposed to compensate the sampling delay.The influence of hardware deviations such as the DC deviation,amplitude deviation,and phase deviation due to the encoder installation deviation or differences in circuits’ electronic components on the encoder’s accuracy is analyzed.Based on this,the improved digital compensation method and the calibration table method are proposed to compensate the deviation.Finally,the deviation compensation technology and the sampling delay compensation technology are verified by building an experimental platform.The sine-cosine signal before the DC deviation compensation and amplitude deviation compensation is compared with after that to verify the DC deviation compensation technology and amplitude deviation compensation technology.The speed fluctuation before the sampling delay compensation and the hardware deviation compensation is compared with after that to verify the deviation compensation technology and the sampling delay compensation technology.According to the experimental tests,the accuracy of the encoder can be effectively improved by the deviation compensation technology and the sampling delay compensation technology.