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This paper proposes a new analytical model for mechanical fault detection in induction motors. Rolling bearing fault has an important percentage compared to others. Most research works focus on rolling bearing faults analysis, the originality of our study relies on the preparation of a new simulated model under rolling bearing faults. First of all, the calculation of the mutual inductances between...
Often encountered driving critical applications, synchronous machines (SM) require reliable condition monitoring systems. In this paper, the advantages of using the field winding current of a synchronous motor as an early indicator of machine faults are demonstrated. Analysis is carried out, both through simulation, via the use of finite element methods (FEM), and through experimentation, using a...
Permanent Magnet Synchronous Machines play a major role in many industrial applications, therefore developing a method to detect the faults, fault type and severity becomes more important. Faults will cause changes to the machine performance and parameters. One of these effects is changing the machine saturation level. This change is reflected in the incremental inductance curve as a change in the...
Induction machines are widely used in different applications. Unpredicted breakdown of these machines usually leads to costly downtime and repairs. These expenses can be minimized by using proper condition monitoring techniques. Eccentricity fault is one of the widespread faults causing machine malfunction; its detection could be useful for preventing of harmful consequences. In this paper, different...
Fault indicators signifying major failures in Synchronous machines (SM) are highlighted. A 15 megawatt (MW) SM was chosen in which, electro-mechanical faults were made by suitably altering physical disposition of machine parts. Finite element simulation of the motor model helped build signature for ideal and fault conditions in time and frequency domains for different fault indicators. Measurements...
This paper deals with the separation of broken magnet failures from static eccentricity (SE) fault using phase current information in permanent magnet synchronous motors (PMSMs). Broken magnet and SE faults exhibit very similar fault patterns in back-emf and flux spectrums. Therefore, these two faults should be discerned from each other for accurate diagnosis. In this paper, phase current waveforms...
Eccentricity is a common mechanical fault in electrical machine operation. In this paper, we have proposed a magnetic equivalent circuit (MEC) model considering magnetic saturation to evaluate and analyse the performance of an interior permanent magnet synchronous machine (PMSM) under eccentricity fault. This model provides the advantages in fast computation while giving reasonable degree of accuracy...
This paper shows a new signature for detection of rotor bar faults in induction motors trough external magnetic field analysis. The proposed method is based on the variations of the axial flux density in the presence of rotor faults, particularly regarding the low frequency part of the frequency spectrum. The analysis of the external magnetic field variation in low frequency is realized through a...
This paper deals with faults in permanent magnet machines used in the traction chain of electrical and hybrid vehicles. First a state of the art is presented on the most encountered faults in these motors: that is permanent magnet demagnetisation, rotor eccentricity and short-circuits of stator windings. Then, an overview of electromagnetic and mechanical signatures of these faults is exposed through...
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