Comparative Analysis of Six-Step and Vector Controlled IPMSM under Inter-Turn Fault

Six-Step operation and vector or field oriented control have become the major control techniques for the brushless permanent magnet motors. However, their reliability is often challenged by the unusual behavior of the motor under the various type of faults. This paper analyzes and compares the performance of interior PM type motor under inter-turn short fault. The case study motor is analyzed using six step operation and field oriented control under different severities of fault. Finite element method based model of the motor is used with control drive designed in Matlab\Simulink. In order to integrate the FEM model with control drives, a multidomain co-simulation technique is adopted for this study. Cosimulation enables us to analyze the extremely nonlinear behavior of the motor under inter turn short fault and the response of control drive simultaneously. Finally, the performance of each control drive under different severities of fault and the important post-fault life of the motor under both control techniques are evaluated. All results are verified by experimental test on a three-phase 400-watt IPM type motor.