IGBT Open-Circuit Fault Diagnostic Methods for SVM-VSI Vector-Controlled Induction Motor Drives

Modified Rotor Flux Estimators for Stator-Fault-Tolerant Vector Controlled Induction Motor Drives

“…Furthermore, it was observed that for the non-faulted condition of the motor, the fault factor modulus equaled zero. The fault factor disappeared for these conditions, which resulted in the fact that the equations of the modified flux estimators (24) and (25) look the same as the equations of the standard estimators (16) and (17). Therefore, it can be concluded that the proposed modified flux estimators can be used during non-faulted conditions as well as faulted conditions of the motors.…”

“…To improve the accuracy of rotor flux estimation during ITSCs using the voltage and current models, a suitable model of the machine was necessary. The VM and CM represented by Equations (24) and (25) can estimate the rotor flux correctly during the faulted and non-faulted conditions of the machine. These models are a new concept for rotor flux estimation.…”

“…The adjusted estimators are called the modified voltage model (MVM) and the modified current model (MCM), and the estimated rotor fluxes by them are marked respectively by ψr vm and ψr im . The MVM is based on Equation 24and the MCM on Equation (25). Figure 8 illustrates the structure of proposed FTC system.…”

“…Fault-tolerant control (FTC) systems have recently been developed for modern IM drives [9,10]. The FTC approach assumes the necessity for the stable operation of a drive even when faults with relatively heavy severity occur in machines [9], power electronics modules [25], and sensors [26]. The main goal of these systems, which are also known as drive systems with a high level of safety, is to enable the drive operation even after fault occurrence.…”