This paper exhibits a novel technique to obtain an encoderless speed control of a permanent magnet synchronous motor (PMSM) in the case of a loss of one phase. The importance of this work is that it presents solutions in order to maintain the operation of the system in various conditions. This will increase the reliability of the whole drive system to meet the safety issues required in some applications. To achieve that, a fault-tolerant inverter modulated through a 3-dimension space vector pulse width modulation technique (3D-SVPWM) is used. Besides that, an algorithm to obtain the exact position of the saturation saliency in the case of a loss of one phase is introduced to achieve a closed-loop field-oriented encoderless speed control and to further enhance the reliability of the whole drive system. This algorithm is based on measuring the transient stator current responses of the motor due to the insulated-gate bipolar transistors (IGBTs) switching actions. Then according to the operating condition (normal or a loss of one phase), the saliency position signals are constructed from the dynamic current responses. Simulation results are provided to demonstrate the effectiveness of the saliency tracking technique under normal and under a loss of one phase conditions. Moreover, the results verify the maximum reliability for the whole drive system that is achieved in this work through a continuous operation of the drive system under a loss of one phase condition and under encoderless speed control.

中文翻译：

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基于SVM-3D的PMSM容错驱动器的无编码器控制

本文展示了一种新颖技术，可在单相丢失的情况下获得永磁同步电动机（PMSM）的无编码器速度控制。这项工作的重要性在于，它提出解决方案以便在各种条件下维持系统的运行。这将提高整个驱动系统的可靠性，以满足某些应用中所需的安全性问题。为此，使用了通过3维空间矢量脉冲宽度调制技术（3D-SVPWM）调制的容错逆变器。除此之外，引入了一种算法，该算法在丢失一相的情况下获得饱和显着性的精确位置，以实现闭环的磁场定向无编码器速度控制，并进一步提高整个驱动系统的可靠性。该算法基于测量由于绝缘栅双极型晶体管（IGBT）的开关动作而导致的电机瞬时定子电流响应。然后根据工作条件（正常或缺相），根据动态电流响应构造显着位置信号。提供的仿真结果证明了显着性跟踪技术在正常情况下以及在一相损失状态下的有效性。此外，结果证明了在整个工作系统中最大的可靠性，这是通过在单相损失和无编码器速度控制下连续运行驱动系统而实现的。然后根据工作条件（正常或缺相），根据动态电流响应构造显着位置信号。提供的仿真结果证明了显着性跟踪技术在正常情况下以及在一相损失状态下的有效性。此外，结果证明了在整个工作系统中最大的可靠性，这是通过在单相损失和无编码器速度控制下连续运行驱动系统而实现的。然后根据工作条件（正常或缺相），根据动态电流响应构造显着位置信号。提供的仿真结果证明了显着性跟踪技术在正常情况下以及在一相损失状态下的有效性。此外，结果证明了在整个工作系统中最大的可靠性，这是通过在单相损失和无编码器速度控制下连续运行驱动系统而实现的。