Fault type detection using frequency pattern of stator current in IPM-type BLDC motor under stator inter-turn, dynamic eccentricity, and coupled faults

This paper considered the frequency pattern of the stator input current to detect the fault types for stator inter-turn fault and dynamic eccentricity fault as well as coupled fault of stator inter-turn fault and dynamic eccentricity fault in a permanent magnet brushless DC motor by monitoring the stator current. In the present study, the additional side-band frequencies of the stator current were analyzed to classify the fault types. As a result, each type of the fault appears the different additional frequency patterns. Therefore, we propose the coupled fault modeling method and the fault type detecting algorithm to efficient fault response.