Single-Phase to Three-Phase Electrolytic Capacitor-Less Dual Inverter-Fed IPMSM for Suppress Torque Pulsation

An electrolytic capacitor-less single-phase to three-phase power converter controls the motor and the input power factor. However, the motor power and the torque are pulsated because the input power of the inverter is irregular. This article proposes a power converter and control method to realize a high input power factor and constant motor torque using a dual inverter without an electrolytic capacitor and an open-end winding machine. The proposed system has the following features. First, the proposed control method achieves a high input power factor by controlling the single-phase ac power without affecting the motor current. Second, the proposed control method compensates the pulsation the of load voltage by using an additional inverter. The proposed circuit configuration and control method contributes to the small size and weight, and high efficiency of the motor drive system with a single-phase power supply. The effectiveness of the proposed system is verified through experiments. The proposed system suppresses torque pulsation by 95.5% compared to the conventional system, and the input power factor is 97.2% at 1.5 Nm and 2500 r/min load condition.