关键词: 重型商用车；永磁同步电机；电机控制器

Abstract: This paper focuses on the research of improving the energy efficiency of the electric drive system for pure electric heavy-duty commercial vehicles, aiming to reduce the vehicle's overall power consumption by minimizing system losses, thereby enhancing the vehicle's range and operational economy. Firstly, the composition of the motor drive system is analyzed, highlighting the motor and controller as the core components of energy consumption. Regarding the motor itself, losses primarily include stator losses, rotor losses, and friction losses; in contrast, losses in the motor controller mainly stem from switching losses and conduction losses of power devices. Secondly, to enhance system efficiency, this paper examines methods for improving system efficiency from four perspectives: system architecture, motor design, motor controller, and control strategy. Finally, the results indicate that the energy efficiency optimization of the motor drive system should focus on stator copper loss control, reducing primary losses through motor design and control algorithms, while optimizing hardware performance with high-voltage architecture and wide-bandgap devices. This systematic balance between efficiency and cost provides an effective pathway for optimizing the energy efficiency of electric drive systems.

Key words: heavy-duty commercial vehicles; permanent magnet synchronous motor; machine controller