针对共直流母线开绕组永磁同步电机(OW-PMSM)非线性因素引起的低次谐波，采用基于最小均方(LMS)算法的自适应陷波器(ANF)对系统中3次、5次、7次谐波进行抑制。首先，分析了OW-PMSM中低次谐波产生的机理；然后，借助Matlab/Simulink探讨了120°解耦调制策略消除逆变器侧调制引起的零序电流，研究了ANF提取系统中相应频次的谐波，将提取的电流谐波补偿到电流环中；再次，抑制了由非线性因素等引起的低次谐波；最后，仿真及试验结果表明，采用ANF后系统中3次、5次、7次谐波含量明显降低。

Aiming at the low harmonics caused by open winding permanent magnet synchronous motor (OW-PMSM) with the common DC bus, the adaptive notch filter (ANF) based on the least mean square (LMS) algorithm is adopted to control the 3rd, 5th, and 7th harmonics in the system. And, an ANF based on the LMS algorithm is used to suppress the 3rd, 5th and 7th harmonics in the system. Firstly, the mechanism of the low harmonics generation in the OW-PMSM is analyzed. Then, with the help of Matlab/Simulink, a 120° decoupling modulation strategy is explored to eliminate the zero-sequence currents caused by the modulation on the inverter side, and the ANF is used to extract the harmonics of the corresponding frequencies in the system, and the extracted harmonics are compensated into the current loop. More, the low harmonics caused by nonlinear factors are suppressed. Finally, the simulation and experimental results show that the contents of the 3rd, 5th, and 7th harmonics in the system are significantly reduced by adopting the ANF.