一种低功耗高精度的正弦编码器细分算法  

Low Power High-Precision Sinusoidal Encoder Interpolation Algorithm

作　　者：郝祥印 苏志刚[1] 张亚娟[1] HAO Xiangyin;SU Zhigang;ZHANG Yajuan(Sino-European Institute of Aviation Engineering,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]中国民航大学中欧航空工程师学院,天津300300

出　　处：《仪表技术与传感器》2023年第7期38-42,共5页Instrument Technique and Sensor

基　　金：中央高校基本科研业务费中国民航大学专项基金项目(3122017111)。

摘　　要：物联网终端设备集成度的提高要求降低磁编码器的功耗,同时要保持磁编码器的精度,因此需要一种可应用于低功耗MCU中的磁栅编码器误差校正与数字细分算法。文中首次建立了包含磁栅尺磁场畸变误差的误差模型,根据误差模型参数的时变特性,提出了使用查找表校正信号中的幅值不等、相移以及谐波误差,利用频域处理消除磁场畸变误差的细分算法,并用实测验证了算法的有效性。实验结果表明:该算法能有效消除上述误差,并将细分精度提高77.5%,整体功耗仅13.7 mW。The increased integration of IoT devices requires reducing the power consumption of magnetic encoders while maintaining the encoder accuracy,so it is necessary to propose a error correction and interpolation algorithm that can be applied in low-power MCUs.In this paper,an error model that contains the magnetic field distortion error of the magnetic scale was developed for the first time.According to the time-varying characteristics of the error model parameters,an interpolation algorithm was proposed that used a look-up table to correct amplitude difference,phase shift and harmonic errors in the signal,and frequency domain processing was used to eliminate magnetic field distortion errors.The effectiveness of the algorithm was verified by actual experiments.Experiments show that the algorithm can effectively eliminate these errors and improve the interpolation accuracy by 77.5%,with an overall power consumption of only 13.7 mW.

关 键 词：正交编码器 数字细分 查找表 频域处理 低功耗 

分 类 号：TH71[机械工程—测试计量技术及仪器]