A new mathematical procedure for the computation of the equivalent inverse sequence impedance in working induction motors

Diagnosis of Eccentric Rotor in Synchronous Machines by Analysis of Split-Phase Currents—Part I: Theoretical Analysis

“…It is finally remarked that this paper originally applies a particular combination of symmetrical component analysis and FFT analysis to a machine with parallel connections in the stator, for RE diagnosis purposes. However, symmetrical components combined with FFT were also used previously for detection of interturn short circuits [38]. Reference [38] carried out the fault-related inverse sequence impedance starting from phase voltages and currents, passing through the calculation of p-order space vectors for a 2p-pole machine, and then applying FFT.…”

“…However, symmetrical components combined with FFT were also used previously for detection of interturn short circuits [38]. Reference [38] carried out the fault-related inverse sequence impedance starting from phase voltages and currents, passing through the calculation of p-order space vectors for a 2p-pole machine, and then applying FFT. In addition, parallel connections in the stator were rarely considered in the literature devoted to fault diagnosis [39], [40].…”

Online computational tools dedicated to the detection of induction machine faults

“…Differential diagnosis is based on multivariable monitoring to assess induction machine rotor conditions [4]. The calculation of the negative impedance is used to the monitoring of the stator fault [5]. The major advantage of this technique is the non dependence on the slip.…”

A spectral method for on‐line computation of the harmonics of symmetrical components in induction machines

“…Information on the symmetrical components can be used to prevent machine damage or the degradation of the torque-speed machine characteristics. The difficulty of measuring the phase angle between the system phasors has led to the development of complex algorithms [13][14][15][16][17] limiting the analysis to the fundamental components of line currents and line-to-line voltages and filtering many important bits of information as harmonic components.…”

“…The description of the computation method for the symmetrical components of an induction machine based on the discrete Fourier transform (DFT) has been presented already [17][18][19]. The new contribution is based on the application of this technique to the computation of all the harmonics contained in the power source and the load.…”