Patent ID: 8362732
Filing Date: 2013-01-29
Classification: G01R

Abstract:
1. A method of detecting a phase winding fault in a multi-phase electric machine, the method comprising: recording a set of feedback signals of the electric machine, including recording each of: a phase current for each phase, reference phase voltages (V* calculating a modulation index (Mi) as a function of the DC bus voltage (V calculating, via a controller, each of: comparing each of the ratio (F), the RMS voltage (Vrms), and the THD to a corresponding calibrated threshold to determine the presence of the phase winding fault; and executing a control action with respect to the electric machine when any of the ratio (F), the RMS voltage (Vrms), and the THD exceeds the corresponding calibrated threshold, wherein the control action corresponds to the calibrated threshold that is exceeded.