A generalized condition monitoring method for multi-phase induction motors

As high power applications in industry commonly employ multi-phase motors and generators, a generic solution is needed for fault diagnosis of various multi-phase systems. Furthermore, the fault criteria set for the severity of the detected fault signature has still been a challenge due to the dynamic behavior of the fault-related signatures in the motor line current. Therefore a generalized solution is needed for multi-phase systems including the adaptive threshold that validates the fault detection algorithm through the entire operation range. In this paper, it is focused on a mathematical analysis of conventional DSP algorithms, frequency tone detectors, including Park´s vector approaches. Based on the analysis, it is theoretically extended and simulated for a contribution of a future online fault diagnosis of multiphase machine.