Abstract: The open-end winding permanent magnet synchronous motor (OW-PMSM)with common DC bus can generate zero-sequence current (ZSC) due to the existence of the zero-sequence path, which can reduce the system efficiency and produce the torque ripple. The traditional ZSC suppression based on closed-loop control and modified modulation method has limited modulation range, thus cannot make full use of the speed range of dual-inverter system. Moreover, considering the cross coupling and dead-time, the ZSC cannot be completely eliminated. In order to suppress the torque ripple caused by the interaction between the ZSC and the third-harmonic back-EMF, a torque ripple suppression method based on modified active disturbance rejection control (ADRC) is proposed. Torque ripple is regarded as a part of the disturbance and estimated by a general-integral extended state observer (GI-ESO). Then a control law based on ADRC is designed to compensate the torque ripple. This method can effectively suppress the torque ripple generated by the ZSC and the third-harmonic back-EMF, especially with the high modulation ratio, so constant-torque speed range was extended. The proposed method is verified on an OW-PMSM drive platform through experimental tests.