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In this work we discuss the efficiency of various stator current signatures for monitoring shaft misalignment that could affect mechanical systems when driven by an induction machine speed-controlled. In that respect, we have considered the Motor Current Signature Analysis, the Current Space Vector, and the Current Park Loci, under no-load as well as under full load conditions. On the other hand,...
Despite the well-known efficiency of the conventional MCSA (Motor Current Signature Analysis) technique for detecting the occurrence of load torque ripples by monitoring of sidebands close to the supply frequency, many other rotor faults produce this same spectral signature leading the user to be faced with a confusing situation. The aim of this paper is to propose an alternative that could overcome...
The aim of this work is to provide an alternative that could replace the conventional technique based on the spectral analysis of the line current to detect an unbalance state due to a weak amplitude drop affecting one of the three-phase currents drawn by a squirrel cage motor. From a theoretical investigation, it has been stated that the spectral analysis of the emf induced at the terminals of a...
For machines׳ monitoring purpose, the classical motor current signature analysis has shown its weakness in distinguishing the eccentricity occurrence in presence of others mechanical faults. Although Park׳s vector approach can cover this drawback, the high cost due to the requirement to use three current sensors associated with an advanced processing technique, makes it less desired by industrialists...
For an induction machine, we suggest a theoretical development of the mechanical unbalance effect on the analytical expressions of radial vibration and stator current. Related spectra are described and characteristic defect frequencies are determined. Moreover, the stray flux expressions are developed for both axial and radial sensor coil positions and a substitute diagnosis technique is proposed...
Because of initial manufacture and ageing phenomenon, rotating machines present an inherent mechanical disequilibrium. When a small mechanical unbalance fault affects the driving system part ensured by an induction machine, an additional undesirable torque will be superposed to the torque imposed by the load. This supplementary torque is a time varying signal according to rotor position. This time...
Traditional fault diagnostic techniques using motor current signature analysis is, generally, based on the assumption of a constant load torque. In fact, due to the design, construction, and ageing phenomenon of loads, torque imposed to the motor can not be strictly constant and, in most of cases, varies according to the machine rotor position. These variations of the load torque, which are not related...
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