Abstract Direct torque control (DTC) is most popular technique used in industries for adjustable speed of drives. It has simple control algorithm without any pulse width modulation technique and vector transformations involvement. Two level voltage source inverter (VSI)-fed permanent magnet synchronous motor (PMSM) operated with DTC has higher torque and flux ripple problems due to the limited voltage vectors availability, which affects the performance of drive. To alleviate these problems, more number of voltage space vectors should be available for DTC of PMSM drive. In this article, DTC for open-end winding PMSM drive (OEW-PMSM) is proposed. A two level dual VSI-fed OEW-PMSM drive configuration attains three level inversion with an equal dc link voltage to VSIs. Similarly four level inversion can also be attained with an unequal dc link voltage of 2:1 ratio given to dual VSIs. Therefore availability voltage space vectors are increased for PMSM drive operation. The effective voltage switching tables for DTC operated OEW-PMSM drive at different speed conditions are proposed to make its performance more satisfactory, thus achieving less torque and flux ripples and also reduced common mode voltage (CMV). To validate this, Simulink/MATLAB and real time experimentation are performed on 3.7 kW PMSM drive.

中文翻译：

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直接转矩控制开放式绕组永磁同步电机驱动的增强型电压开关状态

摘要 直接转矩控制 (DTC) 是工业中最流行的用于驱动器速度可调的技术。它具有简单的控制算法，无需任何脉宽调制技术和矢量变换的参与。使用 DTC 运行的两电平电压源逆变器 (VSI) 馈电永磁同步电机 (PMSM) 具有更高的转矩和磁通纹波问题，因为电压矢量可用性有限，这会影响驱动器的性能。为了缓解这些问题，应该为 PMSM 驱动的 DTC 提供更多的电压空间矢量。在本文中，提出了用于开放式绕组 PMSM 驱动（OEW-PMSM）的 DTC。两电平双 VSI 馈电 OEW-PMSM 驱动器配置实现三电平反转，直流链路电压与 VSI 相等。类似地，也可以通过给双 VSI 的 2:1 比率的不等直流链路电压实现四电平反转。因此，为 PMSM 驱动操作增加了可用性电压空间矢量。提出了在不同速度条件下 DTC 操作的 OEW-PMSM 驱动器的有效电压切换表，使其性能更令人满意，从而实现更小的转矩和磁通纹波，并降低共模电压 (CMV)。为了验证这一点，在 3.7 kW PMSM 驱动器上执行 Simulink/MATLAB 和实时实验。从而实现较小的转矩和磁通纹波，并降低共模电压 (CMV)。为了验证这一点，在 3.7 kW PMSM 驱动器上执行 Simulink/MATLAB 和实时实验。从而实现较小的转矩和磁通纹波，并降低共模电压 (CMV)。为了验证这一点，在 3.7 kW PMSM 驱动器上执行 Simulink/MATLAB 和实时实验。