Condition monitoring algorithm for induction motor drive

The reliability of power electronic devices is of paramount importance in industrial, commercial, aerospace and military applications. The good knowledge and information about the fault mode behaviour of the PWM voltage source inverter is important to improve system design, protection and fault tolerant control. This paper presents a detailed practical study into various fault modes of a PWM voltage source inverter drive. The condition monitoring mechanism is based on discrete wavelet transform (DWT) and fuzzy logic (FL). In this method, the stator currents are used as an input to the system. No direct access to the induction motor is required. The results are equally useful for better monitoring system design and easy fault diagnosis.