Benslimane, T.2015-06-292015-06-292008https://dspace.univ-boumerdes.dz123456789/2124The faulty performance of permanent-magnet (PM) brushless dc motor drives is studied under one and two simultaneous open-switches faults conditions. This DC motor is supplied with three phase two level six IGBT (Insulated-Gate Bipolar Transistor) voltage source inverter. The three phases currents mean, min and max values of the DC motor are used as diagnostic indices. A knowledge algorithm is based to get information on which IGBT is in open-switch fault condition. This algorithm testing shows that the system could not only detect the open-switch fault, but also identify the faulty switch. Presented simulation results confirm the effectiveness of the proposed methodologyenBrushless dc motor drivesDiagnostic indicesFault conditionsFaulty switchesPermanent magnet brushless DC motorThree phaseThree phase voltage inverterThree phasisVoltage source inverterAlgorithmsBrushless DC motorsInsulated gate bipolar transistors (IGBT)Electric drivesArticle