Torque ripple reduction is one of the major challenges in switching table-based direct torque control (DTC) while operating for open phase faults of an induction motor, as the switching vectors are unevenly distributed. This can be minimized by increasing the level of the inverter and with the use of multi-phase motors. Fuzzy logic-based DTC is another solution to the above problem. In this paper, a comparative analysis is done between switching table-based DTC (ST-DTC) and fuzzy logic-based DTC for increasing the performance during open phase faults of a five-phase induction motor. The result shows that in fuzzy logic-based DTC with a two-level inverter, the torque ripple is reduced by 5.164% as compared with ST-DTC with a three-level inverter. The fuzzy logic-based DTC with the three-level inverter also gives better performance as compared with fuzzy logic-based DTC with the two-level inverter. The current ripple also reduced by 9.605% with respect to ST-DTC. Thus, fuzzy logic-based DTC is more suitable and cost effective for open phase fault-tolerant drives.

由于开关矢量分布不均，因此在针对感应电机缺相故障运行时，降低扭矩纹波是基于开关表的直接扭矩控制 (DTC) 的主要挑战之一。这可以通过提高逆变器的级别和使用多相电机来最小化。基于模糊逻辑的 DTC 是上述问题的另一种解决方案。在本文中，对基于切换表的 DTC (ST-DTC) 和基于模糊逻辑的 DTC 进行了比较分析，以提高五相感应电机缺相故障期间的性能。结果表明，在基于模糊逻辑的两电平逆变器DTC中，与三电平逆变器ST-DTC相比，转矩脉动降低了5.164%。与带有两电平逆变器的基于模糊逻辑的 DTC 相比，带有三电平逆变器的基于模糊逻辑的 DTC 也具有更好的性能。相对于 ST-DTC，电流纹波也减少了 9.605%。因此，基于模糊逻辑的 DTC 更适用于开相容错驱动器，且更具成本效益。