Open-Phase Fault and Current Sensor Fault Diagnosis Based on Spatial Distributions of Phase Currents for Dual Three-Phase PMSM Drives
Wenxiang Zhao, Yifan Chen, Tao Tao, Shichuan Ding, Tianyu Zhang
Abstract
This article presents a method for diagnosing and identifying open-phase fault and current sensor fault in dual three-phase permanent synchronous motor (DTP-PMSM) drives. The fault diagnosis method relies on distinct features in spatial distributions of phase currents during open-phase fault and current sensor fault. First, the differences in spatial distributions of phase currents under the open-phase fault and current sensor fault are analyzed. To accurately determine the spatial distributions of phase currents under fault conditions, the second-order general integrator phase locked loop (SOGI-PLL) is introduced to mitigate the distortion caused by the faults. Subsequently, based on the spatial distributions obtained under fault conditions, two indexes are designed to simultaneously diagnose and identify the specific type of fault and the location of fault phase. Experimental results validate the effectiveness of the proposed method under operations exceeding 25% of rated working capacity.