Demodulation analysis for exact rotor faults detection under changing parameters

Diagnosis of Three-Phase Electrical Machines Using Multidimensional Demodulation Techniques

“…Applications to failure detection are available in [7], [14], and [20]- [27]. Interestingly, for a balanced system, it has been shown in [14], [21], [22], [24], and [28] that the Concordia transform (CT), which has been used for failure detection purposes in [14], [21]- [24], and [28]- [38], can also be interpreted as a demodulating tool. As compared to classical demodulation tools, CT exhibits interesting properties such as lower complexity and lack of end effect problems or other artifacts [28].…”

“…In the literature, many criteria and/or techniques have been proposed to perform this task. In [14], [21], [22], [24], [25], and [29], failure severity is measured through statistical criteria. However, these criteria require knowledge of the fault frequencies, which also depend on other parameters (speed or slip information).…”

Motor Current Demodulation Analysis applied with Neural Networks and Genetic Algorithms for Rotor Bar Faults Diagnosis

“…This is way many research [18][19][20] have been conducted to overcome this weakness by Motor Current Demodulation Analysis technique. The basic idea of MCDA technique is to execute during analysis a signal demodulation; this means that to extract some courant signal parts that are related directly to the faults and make analysis only on these parts.…”

Condition Monitoring of Induction Motors Based on Stator Currents Demodulation

“…Hence, current demodulation has been investigated for faults detection and diagnosis. Typical examples include broken rotor bars [18][19][20][21][22], gearbox faults [23] and bearing faults [7], [14], [17], [24]. In order to perform currents demodulation, several authors have employed classical demodulation techniques such as the synchronous demodulator [22], [25][26], the Hilbert transform [18][19][20], [22], [27], timefrequency distributions [14], [17], [28][29][30] or adaptive tracking of sine waves [31].…”

“…In order to perform currents demodulation, several authors have employed classical demodulation techniques such as the synchronous demodulator [22], [25][26], the Hilbert transform [18][19][20], [22], [27], timefrequency distributions [14], [17], [28][29][30] or adaptive tracking of sine waves [31]. Joint IA-IF estimation based on the Concordia transform is investigated in [7], [21], [32]. One advantage of this transform relies on its low computational cost; however, its domain of validity is restricted to balanced three-phase systems.…”