A Model-Based Strategy for Interturn Short-Circuit Fault Diagnosis in PMSM

• Published in: IEEE transactions on industrial electronics (1982) Vol. 64; no. 9; pp. 7218 - 7228
• Main Authors: Mazzoletti, Manuel A., Bossio, Guillermo R., De Angelo, Cristian H., Espinoza-Trejo, Diego R.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.09.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Angular speed; Circuit faults; Coils (windings); Computer simulation; Dynamic models; False alarms; Fault detection; Fault diagnosis; Integrated circuit modeling; interturn short circuit; model-based approach; observer; Observers; Permanent magnets; permanent-magnet synchronous machines (PMSMs); Reliability aspects; Short circuits; State observers; Stator windings; Stators; Synchronous machines; Windings
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2017.2688973

A model-based method for interturn short-circuit fault detection and isolation in permanent magnet synchronous machines (PMSMs) is proposed in this paper. The fault detection is realized based on a residual current vector (RCV) generated by the difference between the measured stator currents and the stator currents estimated by a state observer. In order to avoid false alarms due to possible undesired perturbations, the sequence decomposition of the RCV is performed by employing different reference-frames. Thus, the proposed RCV allows the correct detection of interturn short-circuit faults and quantification of the fault severity in any faulty stator-phase winding. Moreover, since the back-EMF generated by the magnets is proportional to the rotor shaft speed, the electrical angular speed is estimated through the stator voltages measurement, without using a speed sensor. Simulation results from the three-phase PMSM dynamic model that allows considering the interturn short-circuit fault in any stator phase-windings are presented. The proposed method is validated using a three-phase PMSM prototype with modified stator windings. The robustness and the reliability of the proposal was tested for several interturn fault conditions under transient conditions including different disturbances.