Abstract In order to improve the economy of electric vehicles, three dual-motor coupling powertrains are proposed: dual-motor multi-mode coupling powertrain (DMMCP), dual-motor torque coupling powertrain (DMTCP), dual-motor speed coupling powertrain (DMSCP). Among them, DMMCP has two coupling modes of speed and torque, DMTCP can only realize torque coupling, DMSCP can only realize speed coupling. In order to evaluate their performance, they are compared with the traditional single-motor one-speed transmission powertrain (SMOSP) and single-motor two-speed transmission powertrain (SMTSP). The performance of a powertrain is not only related to its topology, but also greatly influenced by the selection of structural parameters. So this paper proposes a method of parameter optimization and optimal performance evaluation, which can obtain the optimal structural parameters while evaluating the performance of a powertrain. The results show that the dual-motor coupling powertrains are better than the traditional single-motor powertrains in the economic performance, and have a broad application prospect.

中文翻译：

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电动汽车不同动力总成优化设计及性能对比

摘要 为了提高电动汽车的经济性，提出了三种双电机耦合动力总成：双电机多模耦合动力总成（DMMCP）、双电机扭矩耦合动力总成（DMTCP）、双电机速度耦合动力总成（DMSCP）。 ）。其中DMMCP有速度和转矩两种耦合方式，DMTCP只能实现转矩耦合，DMSCP只能实现速度耦合。为了评估它们的性能，将它们与传统的单电机单速传动动力总成（SMOSP）和单电机双速传动动力总成（SMTSP）进行了比较。动力总成的性能不仅与其拓扑结构有关，而且受结构参数选择的影响很大。因此本文提出了一种参数优化和最优性能评估的方法，在评估动力总成性能的同时，可以获得最优的结构参数。结果表明，双电机联轴器动力总成的经济性能优于传统的单电机动力总成，具有广阔的应用前景。