Modeling and simulation of short circuit faults in stator coils of brushless DC motor

Abstract

In order to study inter-turn short circuit and inter-phase short circuit fault more effectively, improved mathematical models of brushless DC motor (BLDCM) with faults in stator coil are built up. To reflect the faults state more accurately, a mathematic formula of self-inductance and mutual-inductance between two windings is presented utilizing waveform analysis of magnetic induction intensity. Based on the mathematical model, simulation waveforms under the two kinds of faults have been obtained in Matlab/Simulink. Through simulation analysis, both inter-turn and inter-phase short circuit faults have concealment and continuing faults will accelerate damage level of motor. The model provides a convenient and economical method for the study of short circuit faults. © Springer International Publishing Switzerland 2014.