This paper proposes a hybrid sensorless control strategy for rail transit application employing interior permanent magnet synchronous machine (IPMSM), which works under low switching frequency. Due to a long system time delay, the convergence rate of estimated position in the sensorless dynamic region is reduced. As the speed increases, the dq axes currents coupling is more severe, and deteriorates the control performance. In order to solve these problems, the analysis of time-delay effect on the IPMSM sensorless drives is first derived. Then, using q-axis current error, a global time-delay compensation method is designed to eliminate the lag angle of estimated position. Furthermore, the effect of this compensation on audible noise reduction is also analyzed. Through a phase-locked loop, the hybrid estimated position is obtained from a normalized position error. Finally, a 3.7-kW IPMSM is tested to verify the feasibility of the proposed sensorless method.

中文翻译：

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轨道交通应用中 IPMSM 混合无传感器驱动器的时滞补偿方法


本文提出了一种适用于轨道交通应用的混合无传感器控制策略，采用内置永磁同步电机（IPMSM），在低开关频率下工作。由于系统时延较长，导致无传感器动态区域估计位置的收敛速度降低。随着速度的增加，dq轴电流耦合更加严重，控制性能恶化。为了解决这些问题，首先对IPMSM无传感器驱动器的时滞效应进行分析。然后，利用q轴电流误差，设计全局时滞补偿方法来消除估计位置的滞后角。此外，还分析了这种补偿对可听噪声降低的影响。通过锁相环，从归一化位置误差中获得混合估计位置。最后，对 3.7 kW IPMSM 进行了测试，以验证所提出的无传感器方法的可行性。