记忆电机对基于IGBT逆变器效率的影响

This paper investigates the impact of hybrid memory motors on an IGBT-based inverter in the field-weakening region. Hybrid variable-flux motors have been introduced to overcome the limitations of conventional IPMSMs in traction applications. Different memory motor topologies have been introduced and compared in the literature. Yet, their impact on the drive inverter has not been reported. An existing prototyped ten-horsepower series-hybrid variable motor has been used as a case study in this paper. In the field weakening region, comparing the operation with partially demagnetized magnets to fully magnetized magnets, it is found that not only does the motor current decrease, but the motor power factor also improves. This unique finding of improved power factor operation positively impacts the inverter conduction loss. This has significant practical implications, suggesting that hybrid memory motors can lead to more efficient traction inverters. An air-cooled IGBT-based three-phase 750 V_DC , 30 A_RMS , is used in this study. In the simulation, the switch characteristics from the datasheet have been used for loss calculations. Also, the inverter power loss and efficiency have been measured at different speeds, loads, and magnetization states. A two to three percent improvement in inverter efficiency was noted in the high-speed region beyond two per unit speed.