Abstract: Permanent magnet synchronous motor (PMSM) is developing with the trend of high-speed and high-voltage, which will lead to the increase of the switching ripple in the motor current, resulting in the increase of the motor loss. However, considering the switching loss of the high-power motor driver, the switching ripple cannot be reduced by directly increasing the switching frequency. Dual-frequency permanent magnet motor drivers can efficiently solve the contradiction between high-power and high-switching-frequency. In order to suppress the common-mode circulation current inside the dual-frequency inverter and reduce the capacity requirement of the high-frequency inverter, this paper proposes a common-mode circulation current suppression method. By injecting the zero-axis component into the output voltage of the high-frequency inverter, the common-mode circulation current of the dual-frequency inverter is effectively reduced, so as to reduce the capacity and loss of the power device. Through simulation and experiment, the effectiveness of the proposed method is verified in detail.