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The aim of this paper is to develop a technique for detecting an inter-turn short-circuit in a wound rotor induction machine working as generator by using the bispectral analysis. Bispectral analysis is able to provide more information than power spectrum analysis. In the present investigation, the rotor and stator currents of the machine operating in both healthy and faulty modes are thoroughly analyzed...
Detection of defects or beginning faults is a way to be able to prevent catastrophic faults. Here asymmetrical states of a doubly-fed induction machine, as for example a turn-to-turn fault, are modeled and simulated in state space with hybrid machine equations. These equations are reduced in order of less computation effort. To detect rotor turn-to-turn faults of the doubly-fed induction machine a...
Field oriented control schemes may use different methods for the acquisition of the orientation angle and can operate with or without encoder. In this work the usual variants of field oriented control are implemented and the viability of making the detection and diagnosis of incipient rotor asymmetries in the squirrel cage of induction machines (IMs) is discussed. Then, the utilization of an online...
The analysis of an open phase fault for a five phase induction motor is presented. A circuit based model is developed which can help to predict not only the steady-state performance but also the dynamics including the pulsating torque and to evaluate the small-signal stability of the faulted machine. This is made possible by the utility of the harmonic balance technique on the model of the machine...
This paper presents an accurate and reasonably complicated model to simulate the faulty induction machines. The proposed model is based on a permeance network method (PNM) and the differential equation system governing the induction machine behavior in presence of stator faults. The proposed model allows taking into account the saturation in magnetic circuit due to the fault currents as well as all...
Recently both d-q and instantaneous symmetrical components (i.s.c.) models for faulty cage induction machines have been proposed for numerical simulations of stator instantaneous currents. Applying FFT algorithm to stator current the sideband components at frequencies (1-2s)f can be evaluated. The amplitudes of these components are commonly used as diagnostic index to assess rotor condition in the...
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