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.