PMSM Open-Phase Fault-Tolerant Control Strategy Based on Four-Leg Inverter

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Abstract
Open-phase fault is a common failure in PMSM, which would degrade motor performance and increase its loss due to the unbalanced phase currents. However, conventional fault-tolerant strategies suffer from the tracking problem of sinusoidal current references. In this paper, different from previous fault-tolerant strategies, a new fault-tolerant method for open-phase PMSM is proposed by designing a novel transformation matrix for current/voltage references. With the new transformation matrix, the voltage/current references in d-q frame can be transformed to the phase voltage/current references of the two remaining phases. With the proposed method, open-phase fault-tolerant implementation can be much easier (PI controller is enough) and its performance can be much higher. Besides, as the tolerant method is designed based on four-leg inverter, stronger fault-tolerance capability can be obtained compared with the three-phase inverter-based method. Finally, the experimental results confirm the validity of the proposed fault-tolerant method.
Funding Information
  • National Natural Science Foundation of China (61873020)

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