The existing fault-tolerant three-phase ac drives need split capacitors, auxiliary legs, and triode for alternating current (TRIACs) upon a standard three-phase two-level voltage source inverter (VSI) to obtain the self-healing ability toward open-phase faults (OPFs). In order to reduce the cost, volume, and weight, this article proposes a novel fault-tolerant three-phase surface-mounted permanent magnet synchronous machine (SPMSM) drive without split capacitors, auxiliary legs, or TRIACs. The proposed drive is still built upon a three-phase two-level VSI, whereas its dc-source is directly connected to the neutral point of the motor. First, mathematical model and equivalent circuit are established to reveal the existence of an equivalent dc/dc boost converter in the drive system. Second, the brand-new d -0 axes current references are proposed in order to preserve the motor's performance when an OPF occurs. In this case, both $\boldsymbol{i_{d}}$ and $\boldsymbol{i_{0}}$ are nonconstant. Third, an overall control strategy including the healthy and fault-tolerant modes is presented. In the fault-tolerant mode, a deadbeat current controller is developed to track the nonconstant current references. Finally, experiments are carried out on an SPMSM test-bench to verify the effectiveness of the proposed scheme.

中文翻译：

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创新的容错三相SPMSM驱动器，不带分流电容器，辅助支路或TRIAC

现有的容错三相交流驱动器需要在标准的三相两电平电压源逆变器（VSI）上使用分流电容器，辅助支路和三极管来实现交流电（TRIAC），以获得向开路方向的自愈能力。相位故障（OPF）。为了降低成本，体积和重量，本文提出了一种新型的容错三相表面安装式永磁同步电机（SPMSM）驱动器，该驱动器不带分流电容器，辅助支路或TRIAC。建议的驱动器仍基于三相两电平VSI，而其直流电源直接连接到电动机的中性点。首先，建立数学模型和等效电路以揭示驱动系统中存在等效dc / dc升压转换器。二，全新d 建议使用-0轴电流参考值，以便在发生OPF时保持电动机的性能。在这种情况下，$ \ boldsymbol {i_ {d}} $ 和 $ \ boldsymbol {i_ {0}} $是非恒定的。第三，提出了包括健康模式和容错模式的总体控制策略。在容错模式下，开发了无差拍电流控制器来跟踪非恒定电流基准。最后，在SPMSM测试平台上进行了实验，以验证所提出方案的有效性。