Stator Winding Fault Detection of Permanent Magnet Synchronous Motors based on the Short Time Fourier Transform
More details
Hide details
Wroclaw University of Technology
Marcin Wolkiewicz   

Wroclaw University of Technology
Power Electronics and Drives 2022;7 (42)
In modern drive systems, the high-efficient permanent magnet synchronous motors (PMSMs) have become one of the most substantial components. Nevertheless, such machines are exposed to various types of faults. Hence, online condition monitoring and fault diagno-sis of PMSMs have become necessary. One of the most common PMSM faults is the stator winding fault. Due to the destructive charac-ter of this failure, it is necessary to use fault diagnostic methods that allow fault detection at its early stage. The article presents the re-sults of experimental studies obtained from FFT and STFT analysis of the stator phase current, stator phase current envelope and sta-tor phase current space vector module. The superiority of the proposed method over the classical approach based on the stator current analysis using FFT is highlighted. The proposed solution is experimentally verified under various motor operating conditions. The appli-cation of STFT analysis discussed so far in the literature has been limited to the fault diagnosis of induction motors and the narrow range of the analyzed motor operating conditions. Moreover, there are no works in the field of motor diagnostics dealing with STFT analysis for stator windings based on the stator current envelope and the stator current space vector module.