The integration of nine-phase permanent magnet synchronous machines (nine-phase PMSMs), employed in on-board integrated battery charger for electric vehicles (EVs), into three-phase grid generates an inevitable torque fluctuation in charging and vehicles to grid (V2G) modes. This undesirable torque, which is the source of motor vibration and noise, is due to the interaction among the zero-sequence current, triplen harmonics (third and ninth) of induced back electromotive force, and rotor position. In this article, a new solution for nine-winding integrated battery chargers of EVs is considered. A segmented three-phase PMSM with nine windings is used to replace the nine-phase PMSMs. With this configuration, the system has the advantage of torque-free in charging/V2G mode, low core loss, and simple control (based on the three-phase control) in both traction and charging/V2G modes, with the privilege of employing the reduced number of sensor and with no additional new elements. Through proper three-phase control strategy, the system operates under unity power factor with total harmonic distortion below 5%. Control strategies for charging, V2G, and motoring are given; moreover, the simulation and experimental results are provided to validate the theoretical analysis.

中文翻译：

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将电动汽车的电池充电过程集成到具有 V2G 模式功能的分段三相电机驱动中


将电动汽车 (EV) 车载集成电池充电器中采用的九相永磁同步电机（九相 PMSM）集成到三相电网中，会在充电和车辆到电网 (V2G) 过程中产生不可避免的扭矩波动。 ) 模式。这种不良扭矩是电机振动和噪声的根源，它是由零序电流、感应反电动势的三次谐波（三次和九次）以及转子位置之间的相互作用造成的。在本文中，考虑了一种用于电动汽车九绕组集成电池充电器的新解决方案。采用具有九个绕组的分段式三相 PMSM 来代替九相 PMSM。通过这种配置，系统具有充电/V2G模式下无扭矩、磁芯损耗低、牵引和充电/V2G模式下控制简单（基于三相控制）的优点，并具有采用减少了传感器数量，并且没有额外的新元件。通过适当的三相控制策略，系统在单位功率因数下运行，总谐波失真低于5%。给出了充电、V2G和行驶的控制策略；此外，还提供了仿真和实验结果来验证理论分析。