Demagnetization Fault Detection in Surface-Mounted Permanent Magnet Synchronous Machine

The demagnetization failure of the permanent magnet synchronous motor (PMSM) will cause the performance of the motor to decrease, which has high research value. The first part summarizes the partial demagnetization of PMSM permanent magnets; the second part establishes the Finite Element Model (FEM) of PMSM, and explores the partial demagnetization and uniform demagnetization through the analysis of the magnetic density cloud map and electromagnetic torque signal specialty. In the third part, the FFT signal of the square sum signal of the stator phase current is used to eliminate the power frequency and extract the fault characteristic frequency. The full text is summarized and suggestions for further research are proposed at the last section.