Novel fault diagnostic technique for permanent Magnet Synchronous Machines using electromagnetic signature analysis

This paper proposes a novel alternative scheme for permanent magnet synchronous machine (PMSM) health monitoring and multi-faults detection using direct flux measurement with search coils. Phase current spectrum is not used for analysis and therefore it is not influenced by power supply introduced harmonics any more. In addition, it is also not necessary to specify load condition for accurate diagnosis. In this study, numerical models of a healthy machine and of machines with various faults are developed and examined. Simulation by means of a two-dimensional finite-element analysis (FEA) software package is presented to verify the application of the proposed method over different motor operation conditions.