具有误差抑制功能的磁编码器解码算法研究

Research on Decoding Algorithm of Magnetic Encoder withError Suppression Function

磁编码器作为一种广泛使用的电机转子位置测量装置,其测量精度对整个控制系统的性能有着重要影响。为了提高转子位置测量精度,采用双二阶广义积分器-锁相环(DSOGI-PLL)解码算法提取磁编码器输出信号的正序分量,抑制磁编码器输出信号中存在的幅值误差和相位误差。针对传统二阶广义积分器(SOGI)无法抑制直流偏置误差的缺陷,提出改进型二阶广义积分器(ISOGI)以消除直流偏置误差,提高磁编码器解码精度。仿真和试验结果验证了所提方法的有效性。

As a widely used motor rotor position measuring device,the measuring accuracy of the magnetic encoder has an important impact on the performance of the entire control system.In order to improve the measuring accuracy of rotor position,the dual second-order generalized integrator with phase-locked loop(DSOGI-PLL)decoding algorithm is used to extract the positive sequence components of the output signals of the magnetic encoder,and restrain the amplitude error and phase error in the output signals of the magnetic encoder.Aiming at the defect that the conventional second-order generalized integrator(SOGI)cannot suppress the DC offset error,the improved second-order generalized integrator(ISOGI)is proposed to eliminate the DC offset error and improve the decoding accuracy of the magnetic encoder.The simulation and experiment results verify the effectiveness of the proposed method.