A survey of fault diagnosis methods for induction motors drives under inverter fault conditions

This paper presents a comparative analysis involving several fault diagnosis methods for voltage source inverter in variable speed drives with induction motors. The purpose of using the diagnostic techniques can help to avoid unplanned standstill, to make possible to run an emergency operation in case of a fault or keep the time to repair short in case of a fault. Therefore the fault detection time is a very important parameter to take into account in order to avoid a degradation of the system. In this sense, this paper present the method calIed actuator as sensor applied to the power transistor open circuit fault. A comparison with the traditional techniques is also presented.