Dual-three-phase permanent magnet synchronous machines (DTP-PMSMs) are famous for their fault-tolerant capability. However, the complex modeling, high copper loss, and torque ripple under postfault operation limit their further application. In this article, a fault-tolerant control (FTC) strategy is developed for DTP-PMSMs under the open-phase fault (OPF) with straightforward modeling and smooth output torque. The virtual healthy DTP-PMSM model, where the coordinate transformation, the modulation strategy, and the controller structure remain unchanged under OPF, is adopted in the proposed FTC scheme. And the current references are derived in sinusoidal waves with minimum copper loss. The inaccurate transmission of control signals under OPF is also focused on. Comprehensive theoretical analysis shows the relationship between the controller output voltage and the actual stator voltage should be considered in the proposed FTC strategy; otherwise, distortion in torque and current will be introduced. The voltage compensation is utilized to compensate for the voltage difference and ensure the smooth torque output. Besides, a quasi proportional resonance controller is designed to further suppress the residual torque ripple. The proposed strategy will not induce complex implementation and heavy computation burden. The simulation and experimental results prove the analysis and the effectiveness of the proposed strategy.

中文翻译：

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基于虚拟健康模型的双三相PMSM分析与容错控制


双三相永磁同步电机（DTP-PMSM）以其容错能力而闻名。然而，复杂的建模、高铜损和故障后运行下的扭矩脉动限制了其进一步应用。在本文中，为缺相故障 (OPF) 下的 DTP-PMSM 开发了一种容错控制 (FTC) 策略，该策略具有简单的建模和平滑的输出扭矩。所提出的FTC方案采用虚拟健康DTP-PMSM模型，其中坐标变换、调制策略和控制器结构在OPF下保持不变。电流参考是在铜损最小的正弦波中导出的。 OPF下控制信号传输不准确也是重点关注的问题。综合理论分析表明，所提出的FTC策略应考虑控制器输出电压与实际定子电压之间的关系；否则，将会引起扭矩和电流的畸变。利用电压补偿来补偿电压差，保证扭矩输出平滑。此外，还设计了准比例谐振控制器来进一步抑制残余扭矩脉动。所提出的策略不会导致复杂的实现和繁重的计算负担。仿真和实验结果证明了分析和所提策略的有效性。