A standard three-phase motor drive means a typical two-level voltage source inverter fed three-phase motor drive without any auxiliary circuits. Without fault-tolerant control, common open-circuit faults will cause the breakdown of the standard three-phase motor drives. Although the torque pulsation is theoretically inevitable under the open-circuit faults of standard three-phase motor drives, it's still meaningful to improve the fault-tolerant capability of standard three-phase drives to prolong the reliable operation. In this article, a current optimization based fault-tolerant control is proposed to minimize the proportion of torque loss for standard three-phase permanent-magnet synchronous motor (PMSM) drives under open-phase fault and open-switch fault conditions. Firstly, a two-mode current control is designed to minimize the proportion of torque loss without changing the mathematical model of the faulty motor. Secondly, a three-mode current control is proposed and combined with adjustment of pulse width to tolerate the open-switch faults. Instead of removing the faulty inverter leg directly, the remaining healthy switch in the faulty inverter leg is still utilized. In this way, the damage from torque pulsation can be relieved in the aspect of both frequency and intensity. Finally, the validity of the proposed fault-tolerant control is verified by experiments.

中文翻译：

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标准三相PMSM驱动器基于电流优化的容错控制

标准的三相电动机驱动器是指不带任何辅助电路的典型的由两级电压源逆变器供电的三相电动机驱动器。如果没有容错控制，则常见的开路故障将导致标准三相电动机驱动器发生故障。尽管理论上在标准三相电动机驱动器出现开路故障时不可避免会产生转矩脉动，但提高标准三相电动机的容错能力以延长可靠运行仍然有意义。在本文中，提出了一种基于电流优化的容错控制，以最大程度地减小标准三相永磁同步电动机（PMSM）驱动器在开相故障和开路故障条件下的转矩损失比例。首先，设计了一种双模式电流控制，以在不更改故障电动机的数学模型的情况下将转矩损失的比例降至最低。其次，提出了一种三态电流控制，并结合了脉冲宽度的调整以容忍开路故障。代替直接移除故障逆变器支路，仍然使用故障逆变器支路中的其余正常开关。这样，可以在频率和强度方面减轻转矩脉动造成的损害。最后，通过实验验证了所提出的容错控制的有效性。故障逆变器分支中剩余的正常开关仍被利用。这样，可以在频率和强度方面减轻转矩脉动造成的损害。最后，通过实验验证了所提出的容错控制的有效性。故障逆变器分支中剩余的正常开关仍被利用。这样，可以在频率和强度方面减轻转矩脉动造成的损害。最后，通过实验验证了所提出的容错控制的有效性。