Fault detection in voltage-fed PWM motor drive systems

This paper inv estigates the use of different tec hniques for fault detection in voltage-fed asynchronous machine drive systems. With the proposed tec hniques it is possible to detect and to identify in which power switch the failure has occurred. The detection of the fault condition requires the measurement of voltages and currents and is based on analytical models of both the voltage source inv erter and the asynchronous machine. Simulation and experimental results are presented to demonstrate the correctness of the proposed tec hniques. The results obtained indicate that it is possible to embed some fault-tolerant properties for the voltage-fed asynchronous machine drive system.