A NEW TECHNIQUE FOR SIMULTANEOUS DETECTION OF ONE TO TWO OPEN-SWITCH FAULTS IN THREE PHASE VOLTAGE-INVERTER-FED PM BRUSHLESS DC MOTOR DRIVE

Tarak Benslimane

   The faulty performance of permanent-magnet (PM) brushless dc motor drives is studied under one and simultaneous two open-switches faults conditions. This DC motor is supplied with a three phase two level six IGBT voltage source inverter. The three phases currents mean 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 methodology.

Keywords: brushless dc motors, fault diagnosis, IGBT, one open-switch, two open- switches, mean value, min and max value, logic functions, Boolean value

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