Demagnetization Fault Diagnosis of FSPM Motor Based on ReliefF and SVM

Demagnetization is one of the most probable faults occurring in Permanent Magnet (PM) motors. One of the recently developed Permanent Magnet Synchronous Motors (PMSMs), is the Flux Switching Permanent Magnet (FSPM) motor whose PM is placed on the stator. In this paper, an approach is proposed for the diagnosis of the demagnetization fault in a flux switching permanent magnet motor using electromagnetic torque. In this approach, the harmonic components of the electromagnetic torque are obtained, and then, ReliefF feature selection method is utilized to select the best-ranked harmonic component. The selected harmonic component is then applied to the Support Vector Machine (SVM) classifier to classify different states of the motor's PM. The proposed approach is validated by Finite Element Model (FEM) simulation.