【目的】针对电动汽车两相电机驱动中传统弱磁控制在弱磁区功率受限、输出转矩随转速升高而下降以及前置Boost升压方案导致系统体积和成本增加等问题,本文提出一种基于三相桥复用的Boost与两相半桥逆变一体化电路方案。【方法】针对电动汽车电机驱动系统宽调速运行需求,分析Boost电路与两相半桥逆变电路的工作机理,提出并构建基于三相桥复用的系统拓扑。在此基础上,开展关键参数设计与控制算法设计,并采用建模仿真和理论对比相结合的方法对所提方案进行验证。【结果】结果表明,所提方案在仅少量增加系统体积和成本的前提下,能够有效提升直流电压利用率,实现升压与驱动功能的一体化配合;在不降低输出转矩的情况下,电机调速范围扩大36.08%,验证了该方案在宽调速运行中的有效性。【结论】所提方案较好地兼顾了宽调速性能、系统成本与结构集成度要求,为电动汽车电机驱动系统的低成本、高集成宽调速实现提供了可行的技术路径,具有一定的理论意义和工程应用价值。

[Objective] To address the issues in traditional flux-weakening control for electric vehicle two-phase motor drives—limited power in the flux-weakening region, decreased motor output torque as speed increases, and increased system volume and cost caused by a front-end Boost circuit—this paper proposes an integrated circuit scheme that combines a Boost converter and a two-phase half-bridge inverter based on three-phase bridge multiplexing. [Methods] To meet the wide-speed-range operation requirements of the motor drive system for electric vehicles, the working mechanisms of the Boost circuit and the two-phase half-bridge inverter circuit were analyzed, and a system topology based on three-phase bridge multiplexing was proposed and constructed. Based on this, the key parameter design and control algorithm design were carried out, and the proposed scheme was verified by combining modeling simulation with theoretical comparison. [Results] The results showed that the proposed scheme effectively improved the DC voltage utilization and achieved the integrated coordination of boost and drive functions with only a slight increase in system volume and cost. Without reducing the output torque, the motor speed regulation range was expanded by 36.08%, which verified the effectiveness of the scheme in wide-speed-range operation. [Conclusion] The proposed scheme effectively balances the requirements of wide-speed-range performance, system cost, and structural integration, providing a feasible technical path for the low-cost and highly integrated wide-speed-range implementation of electric vehicle motor drive systems, and possesses certain theoretical significance and engineering application value.