One of the main advantages of dual three-phase permanent magnet synchronous machines (DTP-PMSMs) is their fault-tolerant capability. However, the complex fault-tolerant controller structure, high copper loss and unneglectable torque ripple under postfault operation limit their further development. The inaccurate transmission of control signals under the open-phase fault (OPF) is considered in this article. Undesirable second-order torque ripple and 3rd order current harmonics are induced by the transmission error between the controller output voltage and the actual stator voltage according to theoretical analysis. To cope with this issue, a fault tolerant control strategy based on voltage compensation is developed for DTP-PMSMs under OPF without introducing extra complex control schemes. The current references are derived in sinusoidal forms with minimum copper loss. Only three current loops are utilized in the proposed fault-tolerant strategy, compared to four current loops under normal operation, without changing the control strategy and controller parameters. In terms of compensation performance, since the leakage inductance affects the voltage compensation, a parameter acquisition method based on sine wave current injection is proposed. The proposed strategy does not induce heavy computation burden and has a good steady-state and dynamic response. Simulation and experiment results prove the theoretical analysis and the superiority of the proposed strategy.

中文翻译：

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考虑漏感、减少电流环路的双三相 PMSM 故障后策略


双三相永磁同步电机 (DTP-PMSM) 的主要优点之一是其容错能力。然而，复杂的容错控制器结构、高铜损以及故障后运行下不可忽视的转矩脉动限制了其进一步发展。本文考虑了缺相故障（OPF）下控制信号传输不准确的问题。根据理论分析，控制器输出电压与实际定子电压之间的传递误差会引起不期望的二阶转矩脉动和三阶电流谐波。为了解决这个问题，我们在 OPF 下为 DTP-PMSM 开发了一种基于电压补偿的容错控制策略，而无需引入额外的复杂控制方案。电流参考以正弦形式导出，铜损最小。与正常运行时的四个电流环相比，所提出的容错策略仅使用了三个电流环，并且不改变控制策略和控制器参数。在补偿性能方面，由于漏感影响电压补偿，提出了一种基于正弦波电流注入的参数获取方法。所提出的策略不会造成繁重的计算负担，并且具有良好的稳态和动态响应。仿真和实验结果证明了理论分析和所提策略的优越性。